This probability distribution shows thetypical grade distribution for a Geometrycourse with 35 students.GradeAB.CDF3 2Frequency 51015Find the probability that a student earns agrade of A, B, or C.p = [?]Enter a decimal rounded to the nearest hundredth.
Answers
The probability of an event is obtained as follows:
[tex]Pr(\text{Event)}=\frac{number\text{ of favourable outcomes}}{number\text{ of sample space}}[/tex][tex]\begin{gathered} Pr(a\text{ student earns a grade of A) = }\frac{number\text{ of students that earn grade A}}{Total\text{ number of students}} \\ Pr(a\text{ student earns a grade of A)=}\frac{5}{35} \\ \\ Pr(a\text{ student earns a grade of B)=}\frac{number\text{ of students that earn grade B}}{Total\text{ number of students}} \\ Pr(a\text{ student earns a grade of B)=}\frac{10}{35} \\ \\ Pr(a\text{ student earns a grade of C)=}\frac{\text{number of students that earn grade C}}{Total\text{ number of students}} \\ Pr(a\text{ student earns a grade of C)=}\frac{15}{35} \end{gathered}[/tex]Therefore, the probability that a student earns a grade of A, B or C=
Pr(a student earns a grade of A) + Pr(a student earns a grade of B) + Pr(a student earns a grade of C).
This becomes;
[tex]\frac{5}{35}+\frac{10}{35}+\frac{15}{35}=\text{ }\frac{30}{35}=\frac{6}{7}[/tex]Hence, the probability that a student earns a grade of A, B or C is
[tex]\frac{6}{7}=0.86\text{ (to the nearest hundredth)}[/tex]Related Questions
Stephen began a baseball card collection by purchasing some cards. He increase the number of cards in the collection by a constant amount each week after that. The table below shows the total number of cards in the collection at the end of several weeks. Weeks completed since initial purchase :• 3• 6• 11Number of cards in the collection: •285•420•645How many cards did Steve initially purchase to the beginning of his collection?
Answers
The situation can be represented by a linear function, which is represented by the following expression:
[tex]\begin{gathered} y=mx+b \\ \text{Where, } \\ m=\text{slope} \\ b=y-\text{intercept} \end{gathered}[/tex]Since he increased the number of cards by a constant amount each week, that means we have proportionality:
[tex]\begin{gathered} ^{}m=\frac{\Delta y}{\Delta x} \\ m=\frac{420-285}{6-3} \\ m=\frac{135}{3}=45 \end{gathered}[/tex]Then, by the slope-point form of the line, we can find the equation and then substitute x=0.
[tex]\begin{gathered} y-y_0=m(x-x_0) \\ y-285=45(x-3) \\ y=45x-135+285 \\ y=45x+150 \end{gathered}[/tex]Substituting, x=0.
[tex]\begin{gathered} y=45(0)+150 \\ y=150 \end{gathered}[/tex]At the beginning of the collection, he has 150 cards.
What is the ones place and the hundredths place for 48.26
Answers
The first number before the decimal point is the ones place.
48.26
ones = 8
The second number after the decimal point is the hundredths place:
48.26
hundredth: 6
Evaluate the expression for the given variable values. (p+g) P-29 if p = 4 and q = 8-13-122024
Answers
We have the expression:
[tex]\frac{(p+q)^2}{p-2q}[/tex]We have to evaluate it for p = 4 and q = 8.
To do that, we replace the variables p and q with the given values and calculate:
[tex]\begin{gathered} f(p,q)=_{}\frac{(p+q)^2}{p-2q} \\ f(4,8)=\frac{(4+8)^2}{4-2\cdot8} \\ f(4,8)=\frac{12^2}{4-16} \\ f(4,8)=\frac{144}{-12} \\ f(4,8)=-12 \end{gathered}[/tex]Answer: The value of the expression when p = 4 and q = 8 is -12 [Second option]
Neals family spends $7,104 annually for food. Approximately what percent of their $34,910 annual net income is this amount?
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Total income= $34910
Amount spent on food = $7104
[tex]\begin{gathered} \text{ \% of income spent on food =}\frac{\text{ Amount spent on food}}{\text{ Total income }}\text{ x 100} \\ =\frac{7104}{33910}\text{ x 100} \\ =20.95\text{ \%} \end{gathered}[/tex]What is the vertex of the absolute value function below?
Answers
Step-by-step explanation:
come on !
the vertex is typically a corner or a (general or local) extreme value or turning point of the curve.
so, what can that point be ?
there is only one candidate : (4, 1).
that means x = 4, y = 1.
that is the 4th answer option.
A What is the length of side BC of the triangle? 2x+7 4x7 В Enter your answer in the box. 4x units
Answers
Solution
For this case we can see from the image given that the value for BC is:
4x units
since that represent the lenght of the side
An escalator at a shopping center is 200 ft long and has a vertical rise of 52 feet.What is the measure of the angle formed by the escalator and the ground? Round to the nearest degree
Answers
A right triangle is made, with measure:
From definition:
sin(α) = opposite/hypotenuse
From the picture: opposite to α is side of 52 long and the hypotenuse is 200 ft long. Then:
sin(α) = 52/200
sin(α) = 0.26
α = arcsin(0.26)
α = 15°
find its volume. Use 3.14 as the approximate value of a25 m
Answers
we know that
the solid of the figure is a sphere
the volume of the sphere is equal to
[tex]V=\frac{4}{3}\cdot\pi\cdot r^3[/tex]we have
pi=3.14
r=25 m
substitute
[tex]\begin{gathered} V=\frac{4}{3}\cdot3.14\cdot25^3 \\ V=65,416.67\text{ m\textasciicircum{}3} \end{gathered}[/tex]the volume of the sphere is 65,416.67 cubic metersYasmine makes doll clothes for sewing project she used the pattern below to make the front of a skirt for her sister's doll how many square inches of fabric will Yasmine use the skirt pattern
Answers
The area of the fabric can be determined as,
[tex]\begin{gathered} A=\frac{1}{2}\times(3.5\text{ in+6 in)}\times4\text{ in} \\ =19in^2 \end{gathered}[/tex]Thus, the required area of the fabric is 19 square inch.
Find the volume.The measures are 4 yd, 3 yd, and 5 yd.
Answers
178.98 yd³
Explanation:The shape consists of a cone and a cylinder. So we would find the volume of each and sum them together.
Volume of a cone = 1/3 πr²h
r = radius = 3 yd
h = height = 4 yd
let π = 3.14
Volume of the cone = 1/3 × 3.14 × 3 × 3 × 4
Volume of the cone = 37.68 yd³
Volume of a cylinder = πr²h
r = radius = 3 yd
h = height = 5 yd
Volume of a cylinder = 3.14 × 3 × 3 × 5
Volume of a cylinder = 141.3 yd³
Volume of the shape = Volume of the cone + Volume of a cylinder
Volume of the shape = 37.68 + 141.3
Volume of the shape = 178.98 yd³
Find x1) -4x=362) x+6=133) -9x=36
Answers
1) -4x=36
2) x+6=13
3) -9x=36
SolutionNumber 1[tex]\begin{gathered} -4x=36 \\ divide\text{ both sides by -4} \\ -\frac{4x}{-4}=\frac{36}{-4} \\ \\ x=-9 \end{gathered}[/tex]Number 2[tex]\begin{gathered} x+6=13 \\ collect\text{ the like terms} \\ x=13-6 \\ x=7 \end{gathered}[/tex]Number 3[tex]\begin{gathered} -9x=36 \\ divide\text{ both sides by -9} \\ -\frac{9x}{-9}=\frac{36}{-9} \\ \\ x=-4 \end{gathered}[/tex]- 10x + 100y = 30-3x + 30y = 9
Answers
The given system is
[tex]\mleft\{\begin{aligned}-10x+100y=30 \\ -3x+30y=9\end{aligned}\mright.[/tex]First, we multiply the first equation by -3/10.
[tex]\mleft\{\begin{aligned}3x-30y=-9 \\ -3x+30y=9\end{aligned}\mright.[/tex]Then, we sum the equations
[tex]\begin{gathered} 3x-3x+30y-30y=9-9 \\ 0x+0y=0 \\ 0=0 \end{gathered}[/tex]According to this result, we can deduct that the system doesn't have any solutions because the lines represented by the equations are parallel.in the figure, pr and qs are diameters of circle u. find the measure of the indicated arc
Answers
Step 1: Problem
Step 2 : Concept
QR = 136
PQS = 42 + 136 + 42 = 220
PS = 64 + 72 = 136
A is the set of even numbers greater than or equal to 4 and less than or equal to 8B=1-29, -25,-24, -22, -21, 22, 27(a) Find the cardinalities of A and B.n(A)=3(b) Select true or false.12 € A22 € B67 A-24 € BTruen(B) = 1FalseX%S3
Answers
Set A is composed of all the even numbers equal or greater than 4 and equal or less than 8 so set A is:
[tex]A=\lbrace4,6,8\rbrace[/tex]The cardinalities of A and B are equal to their number of elements so we have n(A)=3 and n(B)=7.
With both sets explicitly written we can complete the true or false table. The only thing to take into account is that the symbol ∈ means "belongs to" and that ∉ means "does not belong to".
The first statement of the table is:
[tex]12\in A[/tex]This is false because 12 does not belong to set A since it is not included in it.
The second statement is:
[tex]22\in B[/tex]As you can see 22 is in deed one of the elements of set B which means that this statement is true.
The third one is:
[tex]6\notin A[/tex]This statement is false because as we saw before 6 is an element of set A.
The last statement is:
[tex]-24\in B[/tex]As you can see -24 is one of the elements of set B so this statement is true.
AnswersFalse
True
False
True
finding slop on the line
Answers
As per given diagram:
Take two points on the line (1,1) and (0,4)
For the slope of the line:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]Now put the values in the formula:
[tex]\begin{gathered} m=\frac{4-1}{0-1} \\ m=\frac{3}{-1} \\ m=-3 \end{gathered}[/tex]So the slopw of the given line is -3.
Where C(x) is in hundreds Of dollars. How many bicycles should the shop build to minimize the average cost per bicycle
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The average cost is given by the next equation:
[tex]C(x)=0.1x^2-0.5x+5.582[/tex]The graph of the function is
As we can see the parabola opens upwards therefore the minim will be located in the vertex
[tex]x=\frac{-b}{2a}[/tex]in our case
b=-0.5
a=0.1
[tex]x=\frac{0.5}{2(0.1)}=2.5[/tex]2.5 hundred
Then
[tex]2.5\times100=250[/tex]Therefore, the shop should build 250 bicycles
4.
8 ft
8 ff
P = (4 X 8)
P=__ ft
A = (8 X 8)
A =
sq. ft
Answers
After multiplying the value of P is 32 ft and the value of A is 64 sq. ft.
In the given question we have to find the value of P and A.
The given expression for P is
P = (4 X 8)
The given expression for A is
A = (8 X 8)
In the given P representing the perimeter of square because the formula of perimeter is
P = 4* side
A representing the area of square because the area of square is
A = side*side
So the value of P
P = (4 X 8)
P = 32 ft
The value of A
A = (8 X 8)
A = 64 sq. ft
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how do you find the sum of 3+15+75+.....+46875 using the Sn formula
Answers
3+15+75+.....+46875
a1 = first term = 3
If we multiply the first term by 5, we obtain the second term.
3 x 5 = 15
15x 5 = 75
75x 5= 375
375x5= 1875
1875x5=9375
9375x5= 46875 (7th term) n=7
So,
r= 5
Apply the formula:
an= a1 * r^(n-1)
an= 3 * 5 (n-1)
Sum
Sn = a1 (1 -r^n) / 1- r
S(7) = [3 (1 - 5^7)] / 1-5
S(7) = [3 (1-78,125)] /-4
S(7) = 58,893
This is my math homework, I don’t understand how to find the seconds of the ball hit the ground
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When the ball hits the ground, the height of the ball to the ground is h(t) = 0.
Therefore, we can now substitute h(t), and solve the function using quadratic formula.
[tex]\begin{gathered} h(t)=-16t^2+16t+400 \\ 0=-16t^2+16t+400 \\ \\ \text{The function is now in standard form where} \\ a=-16,b=16,c=400 \end{gathered}[/tex]Using the quadratic formula, substitute the following values a,b, and c.
[tex]\begin{gathered} t=\frac{ -b \pm\sqrt{b^2 - 4ac}}{ 2a } \\ t=\frac{ -16 \pm\sqrt{16^2 - 4(-16)(400)}}{ 2(-16) } \\ t=\frac{-16\pm\sqrt[]{256-(-25600)}}{-32} \\ t=\frac{ -16 \pm\sqrt{25856}}{ -32 } \\ t=\frac{ -16 \pm16\sqrt{101}\, }{ -32 } \\ \\ t=\frac{-16+16\sqrt{101}}{-32} \\ t=-4.52494 \\ \\ t=\frac{-16-16\sqrt[]{101}\, }{-32} \\ t=5.52494 \end{gathered}[/tex]We have two solutions, t = -4.52494, and t = 5.52494. However, we will disregard the negative time value.
Therefore, the ball will hit the ground after 5.52494 seconds.
angie drew a rectangle. the length of a rectangles she drew is 2 less than three times the width. find the dimensions of the rectangle if the rectangle if the area is 65 square meters
Answers
Answer:
The width of the rectangle is 5
The length of the rectangle is 13
Explanation:
Let's call x the length of the rectangle and y the width of the rectangle.
The length is 2 less than 3 times the width, so
x = 3y - 2
And the area is 65 square meters. Since the area is length times width, we get:
xy = 65
Now, we can replace the first equation x = 3y - 2 on the second one to get
(3y - 2)y = 65
3y(y) - 2y = 65
3y² - 2y = 65
3y² - 2y - 65 = 0
So, using the quadratic equation, we get that the solutions to 3y² - 2y - 65 = 0 are
[tex]\begin{gathered} y=\frac{-(-2)\pm\sqrt[]{(-2)^2-4(3)(-65)}_{}}{2(3)} \\ y=\frac{2\pm\sqrt[]{784}}{6} \\ y=\frac{2\pm28}{6} \\ \text{Then} \\ y=\frac{2+28}{6}=\frac{30}{6}=5 \\ or \\ y=\frac{2-28}{6}=\frac{-26}{6}=-\frac{13}{3} \end{gathered}[/tex]The solution is y = 5 because the width can't have a negative length.
Then, replacing y = 5 on the first equation, we get:
x = 3y - 2
x = 3(5) - 2
x = 15 - 2
x = 13
Therefore, the length of the rectangle is 13 meters and the width of the rectangle is 5 meters
why is this problem incorrect or correct?
Answers
Well, I would like to know more about this problem.
If you are solving an equation it is wrong because you are adding 10 units only in one side of the equation, that is a mistake.
If this is not a process to solve the equation it is correct, it does not matter if you are only adding 10 in one side.
given a function's domain values: -9, -6, -3, 0, 1.5, and 3, what is the range of the function's inverse?
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Answer:
[tex]-9,-6,-3,0,1.5,3[/tex]Explanation:
Given the domain of the function as;
[tex]-9,-6,-3,0,1.5,3[/tex]Note that the range of the inverse of a function is the same as the domain of a function is the original function.
So the range of the inverse of the function will be;
[tex]-9,-6,-3,0,1.5,3[/tex]Please see attachment for question. I have also uploaded a example for reference.
Answers
A=$88,000
P=$70,586
r=9.8% (0.098)
[tex]88,000=70,586e^{(0.098)t}[/tex]Divide both sides by 70,586:
[tex]\begin{gathered} \frac{88,000}{70,586}=\frac{70,586}{70,586}e^{(0.098)t} \\ \\ \frac{88,000}{70,586}=e^{(0.098)t} \end{gathered}[/tex]Find ln of both sides:
[tex]\begin{gathered} \ln (\frac{88,000}{70,586})=\ln (e^{(0.098)t}) \\ \\ \ln (\frac{88,000}{70,586})=0.098t \end{gathered}[/tex]Divide both sides by 0.098:
[tex]\begin{gathered} \frac{\ln (\frac{88,000}{70,586})}{0.098}=\frac{0.098}{0.098}t \\ \\ \frac{\ln(\frac{88,000}{70,586})}{0.098}=t \\ \\ \\ t=2.25 \end{gathered}[/tex]Then, t is 2.25 yearsA person can join The Fitness Center for $50. A member can rent the tennis ball machine for $10 an hour. Write a linear function to model the relationship between the number of hours the machine is rented (x) and the total cost (y).
(a) write a equation for this problem
(b) what is the initial value
(c) Determine the cost for renting the tennis ball machine for 2 hours? for 5 hours? and 0 hours?
(d) How many hours did a member rent the tennis ball machine if the total cost was $130?
Answers
a) An equation for the given problem is;
b) The initial value for the given problem is;
c) The number of hours that a member rented the tennis ball machine if the total cost was $130 is; 4 hours
How to solve a Linear equation model?The general formula for the equation of a line in slope intercept form is;
y = mx + c
where;
m is slope
c is y-intercept
a) Base price for joining the fitness center is $50 and as such this can be said to be the y-intercept. Then, the tennis ball machine is rented for $10 per hour.
Now, the number of hours the machine is rented (x) and the total cost (y), then the equation is;
y = 10x + 50
b) The initial value is the price when x = 0 which is the y-intercept and as such it is $50.
c) The cost for renting the tennis ball machine for 2 hours is;
y = 10(2) + 50
y = $70
The cost for renting the tennis ball machine for 5 hours is;
y = 10(5) + 50
y = $120
The cost for renting the tennis ball machine for 0 hours is;
y = 10(0) + 50
y = $50
d) If total cost is $130, then we have;
130 = 10x + 50
10x = 80
x = 80/10
x = 8 hours
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how far does a person travel in ft? this word problem is a little confusing but i understood everything else before this question.
Answers
Given:
The vertical height is 30ft.
The angle of elevation is 30 degrees.
To find:
The distance travelled by the person from bottom to top of the escalator.
Explanation:
Let x be the slant distance.
Since it is a right triangle.
Using the trigonometric ratio formula,
[tex]\begin{gathered} \sin\theta=\frac{Opp}{Hyp} \\ \sin30^{\circ}=\frac{30}{x} \\ \frac{1}{2}=\frac{30}{x} \\ x=30\times2 \\ x=60ft \end{gathered}[/tex]Therefore, the distance travelled by the person from the bottom to the top of the escalator is 60ft.
Final answer:
The distance travelled by the person from bottom to top of the escalator is 60ft.
Given v=7i - 5j and w=-i+j,a. Find project wv .b. Decompose v into two vectors V, and v2, where vy is parallel to w and v2 is orthogonal to w.
Answers
For the given vector v=7i - 5j and w=-i+j,
projwv = 6i - 6j
v1 = 6i -6j
v2 = i +j
Vector:
A quantity that has both magnitude and direction are called vector. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude.
a) projwv is the projection of v onto w. Use the following equation:
projwv = [(v•w)/((magnitude(w))2)] w
v•w = (7*-1) + (-5*1) = -12
(magnitude w)^2 = ([tex]\sqrt{1^{2} + 1^{2}}[/tex])^2 = 2
projwv = ((-12)/2)(-i + j)
= 6i - 6j
b) The two components of the decomposed v will add to create the original vector v. v1 that is parallel to w will be the same as the projection of v onto w.
v = v1 + v2
v2 = v - v1 = (7i - 5j) - (6i -6j) = i +j
You can check that v2 is orthogonal by taking the dot product (v2•w). This equals 0.
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Hello hope you are doing well. Can you help me with this please
Answers
To find Mario's current grade is to find the average of all his grades for the first quarter.
The average of his grade for the first quarter is the mean which is 70 percent.
Also, 70 percent is equivalent to a C minus
Add 28, 362, and 104. Choose the appropriate number for each place value in the sum. Hundreds Tens Ones Intro
Answers
ANSWER
[tex]494[/tex]EXPLANATION
We want to add the three numbers:
[tex]28,362,104[/tex]To do this, add the numbers in corresponding place values i.e. units to units, tens to tens, and hundred to hundred:
[tex]\begin{gathered} 28 \\ +362 \\ +104 \\ =494 \end{gathered}[/tex]That is the answer.
The sides of a rectangle are in a ratio of 5:7 and the perimeter is 72. Find the area of the rectangle.
Answers
Since the sides of the rectangle are in ratio 5: 7
Insert x in the 2 terms of the ratio and find its perimeter using them
[tex]\begin{gathered} L\colon W=5x\colon7x \\ P=2(L+W) \\ P=2(5x+7x) \\ P=2(12x) \\ P=24x \end{gathered}[/tex]Equate 24x by the given perimeter 72 to find the value of x
[tex]24x=72[/tex]Divide both sides by 24
[tex]\begin{gathered} \frac{24x}{24}=\frac{72}{24} \\ x=3 \end{gathered}[/tex]Then the sides of the rectangle are
[tex]\begin{gathered} L=5(3)=15 \\ W=7(3)=21 \end{gathered}[/tex]Since the rule of the area of the rectangle is A = L x W, then
[tex]\begin{gathered} A=15\times21 \\ A=315 \end{gathered}[/tex]The area of the rectangle is 315 square units
Triangle ABC , m∠A = 75°, m∠B = 65°, a = 23.5ftFind the length of the shortest side.Round to one decimal.
Answers
Given in triangle ABC , m∠A = 75°, m∠B = 65°, a = 23.5ft.
We have to find the third angle,
[tex]m\angle C=180-75-65=40[/tex]The shortest angle is angle C. So, the shortest side will be opposite to angle C.
Use the sine rule, to find the third side as follows:
[tex]\begin{gathered} \frac{\sin A}{a}=\frac{\sin C}{c} \\ \Rightarrow\frac{\sin75}{23.5}=\frac{\sin 40}{c} \\ \Rightarrow\frac{0.966}{23.5}=\frac{0.643}{c} \\ \Rightarrow0.0411=\frac{0.643}{c} \\ \Rightarrow c=\frac{0.643}{0.0411} \\ \Rightarrow c=15.6 \end{gathered}[/tex]Thus. the length of the shortest side is 15.6 ft.