Answer:
The amount of carbon-14 in the fossil is 15% of the amount of carbon-14 in a living beetle.
This means that the amount of carbon-14 in the fossil is 0.15 * the amount of carbon-14 in a living beetle.
The age of the fossil can be found by dividing the half-life of carbon-14 by the logarithm of the ratio of the amount of carbon-14 in the fossil to the amount of carbon-14 in a living beetle.
This means that the age of the fossil is 5715 years / log(0.15).
The age of the fossil is approximately 5715 years / -1.1761.
Therefore, the age of this fossil is approximately <<4895.4683=4895>>4895 years.
Plssss need help
Don’t understand
find the slope of the line passing through the origin which forms an angle 7pi/8 with a positive x axis
The slope of the passing line through the origin is 112.5°.
The slope of a line is given as a tangent ratio.
In this case we have the angle, so the slope would be given as
tan(7π/8).
Therefore,
The angle the line makes with the horizontal is given in radians here:
7π/8
In this degrees, we can use:
180° = π radians
1 radian = 180°/π
5π/8 radians = 5π/8 × 180° /π
=5π/8 × 180°/π
=112.5°
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Help please! It’s for an assignment. My grade is low and I need to bring it up
Answer:
Step-by-step explanation:
i think it is 74
each square of the three by three grid is painted so that the whole picture has at least the two lines of symmetry indicated. each grid square is painted one solid color. what is the maximum number of colors that could have been used?
3 colors are the maximum that can be used.
What is square?
Having four equal sides, a square is a quadrilateral. There are numerous square-shaped objects in our immediate environment. Each square form may be recognized by its equal sides and 90° inner angles. A square is a closed form with four equal sides and interior angles that are both 90 degrees. Numerous different qualities can be found in a square.
each square of the three-by-three grid is painted so that the whole picture has at least the two lines of symmetry indicated.
each grid square is painted one solid color
Based on the symmetry lines the groups that must be the same color are
{1,3,7,9}
{2,4,6,8}
and {5}
Hence, 3 colors are the maximum that can be used.
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alina wants to make keepsake boxes for her two best friends. she doesn't have a lot of money, so she wants to make each box described so that it holds as much as possible with a limited amount of material. for eliza, alina wants to make a rectangular box whose base is twice as long as it is wide. this box will be lined on the entire inside with velvet and in addition the outside of the top of the box is to be lined in velvet. if alina has 300 square inches of velvet, how can she make eliza's box so that it holds as many keepsakes as possible? find the width (w), length (l), and height of the box in inches. (round your answers to three decimal places.)
The width, length and height of the box is 12.247 inch, 24.494 inch, 73.482 inch respectively.
We have given that Alina wants to make a rectangular box whose base is twice as long as it's wide and alina has 300 square inches of velvet.
i.e A = l × w
it s given that l = 2w
∴ A = 2w²
⇒ 300 = 2w²
w² = 150
w = 12.247 inch
i.e. l = 2w
l = 2(12.247)
l = 24.494 inch
Therefore length of the box is 24.494 inch and width is 12.247 inch.
Now we have to find height of the box.
For the height of rectangle we know the formula
i,e, Height = [tex]\frac{P}{2}[/tex] - w
where P is perimeter
we will first find perimeter of rectangle.
Therefore P = 2(l + w)
P = 2(24.494 + 12.247)
P = 2(36.741)
P = 73.482 inch
Hence the height of the rectangle is 73.482 inch.
Therefore the Eliza's box that Alina make has width 12.247 inch, length 24.494 inch and height 73.482 inch.
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true or false: a) every unitary operator u : x ! x is normal. b) a matrix is unitary if and only if it is invertible.
True, Every normal unitary operator u: x! x exists.
False, An if only if it is invertible, a matrix qualifies as unitary.
What is the matrix?
A group of numbers built up in a rectangular array with rows and columns. The elements, or entries, of the matrix, are the integers. In addition to numerous mathematical disciplines, matrices find extensive use in the fields of engineering, physics, economics, and statistics.
Here, we have
a. Every unitary operator U:X→X is normal as an operator A is unitary if A*A = AA* = I and an operator is normal if A*A = AA*.
Hence, every unitary operator u: x → x is normal.
b. A unitary matrix is always invertible but an invertible matrix need not be unitary. An invertible matrix A is unitary if A⁻¹ = A*
Hence, it is not true.
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PLEASE HELP ASAP THANK YOU
in triangle LMN, m∠L = (6c + 35)°. If the exterior angle to ∠L measures 79°, determine the value of c.
c = 24
c = 7
c = 44
c = 11
The value of c for the angle of the triangle will be 7.34.
What are sides and angles?Congruence and likeness tests in geometry require comparing matching sides and angles of polygons. Each side and angle in one polygon is paired with a side or angle in the second polygon in these tests.
Given that in triangle LMN, m∠L = (6c + 35)°. If the exterior angle to ∠L measures 79°,
The value of angle c will be calculated as,
(6c + 35)° = 79°
Apply the mathematical operations and solve further,
6c = 79 - 35
6c = 44
c = 7.34
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Evaluate the expression for the given value of the variable. 49 + 1/8y, y= -1/2
Answer:
48 and 15/16
Step-by-step explanation:
49+1/8(-1/2)
49+(-1/16)
48 and 15/16
The required value of the expression is 3 when substituting the value of -1/2 for y.
What is the algebraic expression?Algebraic expressions are mathematical statements with a minimum of two terms containing variables or numbers.
The expression is given in the question as:
49 + 1/8y
To evaluate the expression, we need to substitute the value of -1/2 for y. Doing this gives us:
⇒ 49 + 1/8(-1/2)
⇒ 49 + (-1/16)
Simplifying the expression further gives us:
⇒ 49 - 1/16
⇒ (16 × 3 + 1 - 1)/16
⇒ 48/16
Apply the division operation, and we get
⇒ 3
Therefore, the final value of the expression is 3.
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sergio read the first 18 pages of a novel in 2 hours what is the unit rate at which he is reading plss help asap tysm <3
The answer will be (9)
Step-by-step explanation:
The first step to dividing fractions of 18 divide 2 than (reverse the numerator and denominator) of the second fraction. Next, multiply the two numerators.
If Sergio read 18 pages of novel in 2 hours, than he's only reading 9 pages at a time than the next!
Does anyone know what -7x > -35 is?
The given expression is showing an inequality.
What is an inequality?An inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions.
Given that, -7x > -35
The given expression is showing inequality where -7x is greater than -35
On simplifying, we get,
-7x > -35
7x < 35
x < 5
Therefore, x is less than 5
Hence, The given expression is showing an inequality.
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50 points decreased by 26%
step by step
Answer:
37
Step-by-step explanation:
50*26%
50-(50*26%)
Factorise - 3 x square y - 3 x + 9 x y
square
The factorization of the given expression is -3x(xy+3y-1).
The given expression is -3x²y-3x+9xy².
What is factorization?The factorization method uses basic factorization formula to reduce any algebraic or quadratic equation into its simpler form, where the equations are represented as the product of factors instead of expanding the brackets. The factors of any equation can be an integer, a variable, or an algebraic expression itself.
The factorization of the given expression is as follows
-3x²y-3x+9xy²
= -3x(xy-1+3y)
= -3x(xy+3y-1)
Therefore, the factorization of the given expression is -3x(xy+3y-1).
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solve for x
2 | 3x + 1 | -4 =6
Step-by-step:
2 | 3x + 1 | -4 = 6
2 | 3x + 1 | = 10
| 3x + 1 | = 5
| 3x + 1 | = ±5
Solve for both: 3x + 1 = -5 AND 3x + 1 = 5
3x + 1 = - 5
3x = - 6
x = -2
3x + 1 = 5
3x = 4
x = 4/3
x = -2, 4/3
Answer:
3
Step-by-step explanation
a boat travels 42 miles upstream in 3 hours looking for a lost diver. it then travels downstream 70 miles in 2 hours. write a system to represent the situation. then find the speed of the boat and the speed of the current. use b for boat and c for current.
The system of equations for the given situation are 14=b-c ; 35=b+c and the speed of boat is 24.5 miles/hr and speed of current is 10.5 miles/hr.
Given,
Distance covered by boat in upstream in 3 hours = 42 miles
Distance covered by boat in downstream in 2 hours = 70 miles.
Let
speed of boat in still water be 'b'
speed of current of stream be 'c'
we know that distance=speed x time
If the boat is moving upstream, the current (which is 'c' miles per hour) will push against it, reducing the boat's speed by 'c' miles per hour. The boat's resulting speed (as it travels upstream) is 'b-c' miles per hour. If, on the other hand, the boat is travelling downstream, the current will push it faster, increasing the boat's speed by 'c' miles per hour. The boat's downstream speed is 'b+c' miles per hour as a result.
Then the system of equations will be
distance while going upstream ,
distance=speed x time
42=(b-c)(3)
14=b-c....i
distance while going downstream,
70=(b+c)(2)
35=b+c....ii
solving eq. i and eq. ii
14=b-c
35=b+c
------------
49=2b
b=24.5
Substitute in eq. i,
14=24.5-c
c=24.5-14
c=10.5
Thus, the boat's speed is 24.5 miles per hour and the current's speed is 10.5 miles per hour.
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how many even integers are there bewteen 200 and 700 whose digits are all diferetn and come from the set (1,2
There are 12 even integers are there between 200 and 700 whose digits are all different and come from the set (1, 2, 5, 7, 8, 9}.
What is number of permutation?
Take the number of possibilities for each event and multiply it by itself X times, where X is the total number of events in the sequence, to determine the number of permutations.
For instance, four-digit PINs have 10 possible combinations because each digit can range from 0 to 9.
We see that the last digit of the 3 -digit number must be even to have an even number. Therefore, the last digit must either be 2 or 8.
Case 1 - the last digit is 2. We must have the hundreds digit to be 5 and the tens digit to be any 1 of {1,7,8,9}, thus obtaining 4 numbers total.
Case 2 - the last digit is 8. We now can have 2 or 5 to be the hundreds digit, and any choice still gives us 4 choices for the tens digit. Therefore, we have 2 x 4 = 8 numbers.
Adding up our cases, we have 4 + 8 = 12 numbers.
Hence, there are 12 even integers are there between 200 and 700 whose digits are all different and come from the set (1, 2, 5, 7, 8, 9}.
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Complete question:
how many even integers are there between 200 and 700 whose digits are all different and come from the set (1, 2, 5, 7, 8, 9}.
On a multiple-choice test of
92 questions, a student gets 16 questions wrong. To the nearest tenth of a percent, what percent of the questions did the student solve correctly?
in the five whys, why is it important to continue to ask why after asking why the problem occurred? g
The reason asking why the problem occurred This frequently identifies problems with the organization or places where processes need to be addressed.
What is 5 Whys?The process is remarkably straightforward: whenever an issue arises, you ask "Why?" five times to get to the bottom of it. Then, when a remedy emerges, you put it into action to stop the problem from happening again.
The nice thing about 5 Whys is that it challenges you to move beyond blaming and question why that occurred.
This frequently identifies problems with the organization or places where processes need to be addressed.
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A phone company offers two monthly plans. Plan A costs $16 plus an additional
$0.18 for each minute of calls. Plan B costs $28 plus an additional $0.14 for each minute of calls.
The total cost and the number of minutes of the plan will be $70 and 300 minutes, respectively.
What is a linear equation?A connection between a number of variables results in a linear model when a graph is displayed. The variable will have a degree of one.
The linear equation is given as,
y = mx + c
Where m is the slope of the line and c is the y-intercept of the line.
A telephone organization offers two month-to-month designs. Plan An expense of $16 in addition to an extra $0.18 for every moment of the call. Plan B costs $28 in addition to an extra $0.14 for every moment of the call.
Let 'y' be the total amount and 'x' be the number of minutes. Then we have
y = 0.18x + 16 ...1
y = 0.14x + 28 ...2
From equations 1 and 2, then we have
0.18x + 16 = 0.14x + 28
0.18x - 0.14x = 28 - 16
0.04x = 12
x = 12 / 0.04
x = 300
Then the value of the variable 'y' will be given as,
y = 0.18(300) + 16
y = 54 + 16
y = $70
The total cost and the number of minutes of the plan will be $70 and 300 minutes, respectively.
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Three times a number, minus nine, equals six times six, divided by four. In the box, type an equation to represent this situation. Use capital X for the variable and a small x to show multiplication. Show division with a slash (/). Do not add any spaces.
Answer:
Answer:
3X-9=(6x6)/4
Step-by-step explanation:
Find the probability that a randomly selected car from this sample had 222 doors or 444 doors.
A car is selected from random sample of 100 cars,
a) The events for which the selected car has 2 doors and 4 doors are mutually exclusive event ;
i.e P(A ∩ B) = 0.
b) The probability that a randomly selected car from this sample had 2 doors or 4 doors is 0.77..
Mutually exclusive event :
A and B are mutually exclusive if they cannot occur at the same time. This means that A and B have no common result and P(A and B) = 0.
We have given a Venn diagram which consists the cars have sunroof , 2 doors and 4 doors.
Firstly we need to understand the Venn diagram properly for determining the required probability values.
From Venn diagram ,
Total number of cars in sample = 100
Cars with sunroof only = 13
Number of cars with 2 doors only = 14
Number of cars with 4 doors only = 25
Number of cars with sunroof and 2 doors = 18
Number of cars with sunroof and 4 doors = 20
a) let us consider two events A and B
A : car with two doors
B : car with four doors
As we see in Venn diagram,
the number of cars with 4 doors and 2 door, n(A∩B) = 0 => P(A and B) = 0
so, by definition of mutually exclusive event
A and B are are mutually exclusive events.
b) Probability that car with 2 doors, P(A)
= favourable outcomes for A / total outcomes
= 14+18/100 = 32/100
Probability that car with 4 doors, P(B)
= favourable cases for B/ total outcomes
= 25+20/100 = 45/100
Probability that randomly selected car from this sample had 2 doors or 4 doors = P( A or B)
= P(A) + P(B) = 77/100 = 0.77
Hence, the required probability is 0.77..
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Complete question:
Two-way tables, Venn diagrams, and probability Sunroof 13 10 18 20 14 25 2 doors 4 doors In this sample, are the events "2 doors" and "4 doors" mutually exclusive? Choose 1 answer A Yes O No Find the probability that a randomly selected car from this sample had 2 doors or 4 doors. O of 4
Serena claims that (x+3) is a factor of p(x)=x4+6x3+12x2+10x+3. Which equation must Serena show to be true in order to prove her claim?
A
p(0)=3
B
p(3)=0
C
p(0)=−3
D
p(−3)=0
Answer:
In order to prove that (x+3) is a factor of p(x), Serena must show that p(-3) = 0. This means that if we plug -3 into the polynomial p(x), the resulting value must be 0. Therefore, the correct answer is option D, p(-3)=0.
Step-by-step explanation:
What happens to an image after a dilation?
After dilation, the shape of the image and preimage will be same, but the size will be different
The dilation is the one form of transformation, that will change the size of the original figure, but the shape of the figure remains same
Consider a triangle and dilating the triangle by a scale factor of 3
The scale factor 3 means the size of the original image will enlarge by three times of the original size .
Still the shape of the triangle will be same, but the size of the triangle changed according to the dilation
Therefore, size of the image will change, but the shape will not change
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a program admissions coordinator wanted to know if the math placement test given to a certain cohort of students was an indicator on how well they would perform on their first exam. she records the scores of their placement test and first exam below. is there a correlation between these measures? placement exam 1 11 49 27 71 7 60 33 85 28 80 23 75 20 61 48 100 35 71 26 81
Yes, there is a correlation between these measures. The higher the placement exam score, the higher the student's score on their first exam tends to be. For example, students with placement exam scores of 11 and 49 had first exam scores of 27 and 71 respectively, indicating that the higher the placement exam score, the higher the first exam score.
What does the word "measure" mean?A measure in mathematics is a generalization of the ideas of length, area, and volume. Measures are sometimes referred to as "mass distributions" informally. A measure, in more exact terms, is a function that gives numbers to particular subsets of a given set. This quantity is described as the set's measure.
What are some measures' examples?To measure length or distance, this system employs inches, feet, yards, and miles. Volume or capacity are expressed in fluid ounces, cups, pints, quarts, or gallons. In ounces, pounds, and tons, weight or mass is expressed.
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Evaluate 11.5x + 10.9y when x = 6 and y =7
[tex]11.5x+10.9y[/tex] when x is 6 and y is 7
Substitute:
[tex]11.5(x)+10.9(y)[/tex]
[tex]11.5(6)+10.9(7)[/tex]
Solve:
[tex]11.5\times6=69\\10.9\times7=76.3[/tex]
[tex]69+76.3[/tex]
[tex]=\fbox{145.3}[/tex]
What is the equation of the line that passes through (- 1/3 and has a slope of 2?
The equation of a line that passes through [tex](-1,3)[/tex] and has a slope [tex]2[/tex] is [tex]y=2x+5[/tex]
The equation of the line passes through the point is [tex](-1,3)[/tex]
One point and the slope are given, we will use one point form i.e.
[tex]y=mx+c.....(1)[/tex]
The point [tex](-1,3)[/tex] satisfies the equation and the slope is [tex]2[/tex]
Plug in these values in (1)
[tex]3=2(-1)+c\\3=-2+c\\c=3+2\\c=5[/tex]
Plug in the value of slope and c is
The equation becomes [tex]y=2x+5[/tex]
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-16 5/8-(13 3/8) please help
Answer:
-30
Step-by-step explanation:
Your welcome.
The sale price for an item is $72, the discount is 64% off, what is the original price???
Answer: The original price is 200$
Step-by-step explanation:
original price = 100 percent
100-64=36
36% =72
100%= x
use cross multiply
36x=100*72
36x=7200
x=200
The original price is 200$
Answer:$200
Step-by-step explanation:
$72 is 100-64 or 36% if the original price.
First, we convert the percentage into a decimal number.
So, 0.36.
Next we divide that by $72
The answer is $200
A triangle has vertices a(-2, 3), b(0, 0), and c(1, 2). What are the coordinates of the vertices if the triangle is reflected over the y-axis and then dilated by a scale factor of 2?.
The triangle's vertices will therefore be A'(4, 6), B'(0, 0), and C'(-2,4) if it is mirrored across the y-axis and then dilated by a scale factor of 2.
Define scale factor.The ratio of the scale of an original thing to a new object that is a representation of it but of a different size is known as a scale factor (bigger or smaller). For instance, we can increase the size of a rectangle with sides of 2 cm and 4 cm by multiplying each side by, let's say, 2.
Given
In line with the posed question.
Triangle ABC's vertices are A(-2, 3), B(0, 0), and C. (1, 2).
As we are aware,
The x-coordinates of each point must be negative while keeping the y-value constant in order to reflect a triangle over the y axis.
As a result, when triangle ABC is mirrored across the y-axis, its vertices are
A'(2,3)
B'(0, 0)
C'(-1, 2)
The vertices of the triangle will also change when it is dialated by a scale factor of 2.
A'(4, 6)
B'(0, 0)
And, C'(-2, 4)
The triangle's vertices will therefore be A'(4, 6), B'(0, 0), and C'(-2,4) if it is mirrored across the y-axis and then dilated by a scale factor of 2.
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an insurance company conducted an opinion poll for a new health policy. in a sample of 200 participants, 117 of them supported this policy. does this provide strong evidence that more than a half of americans are supporting the new health policy? compute the value of the test statistic (round off to first decimal place).
Therefore , the p- value is 0.008 , thus half of population is supporting.
Describe the hypothesis .A hypothesis is a proposed explanation for a phenomenon. The scientific method states that a theory cannot be deemed scientific unless it has been put to the test. The majority of scientific ideas are founded on historical findings that are insufficiently explained by current knowledge.
Here,
test statistics Z=
Z = [tex]\frac{p-p'}{\sqrt{p'(1-p')/n} }[/tex]
for
H0 : p= 0.5
And
Ha: p>0.5
Z =(0.585-0.5) / ((0.5)(0.5)/200)
Z=2.4
Since p =x/n=117/200=0.585
Thus
p- value= P(Z>2.4)=1-Ф(2.4)=1-0.992 =0.008
Therefore , the p- value is 0.008 , thus half of population is supporting.
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a researcher wishes to estimate within $300 the true average amount of money a county spends on road repairs each year. if she wants to be 90% confident, how large a sample is necessary? the standard deviation is known to be $900.
The sample size should be 24.
What is the sample size?
The process of deciding how many observations or replicates to include in a statistical sample is known as sample size determination. Any empirical study with the aim of drawing conclusions about a population from a sample must take into account the sample size as a crucial component.
Here, we have
Given
Margin of error = 300
confidence level = 0.9
standard deviation = 900
Assuming the standard deviation to be of population
ME = Z(0.1/2) × σ/√n
300 = 1.645 × 900/√n
n = {(1.645 × 900)300}²
n = 24
Hence, the sample size should be 24.
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