Answers
Given
[tex]f(x)=2x^2-4x-3[/tex]
Procedure
[tex]\begin{gathered} f(-1)=2\cdot(-1)^2-4\cdot(-1)-3 \\ f(-1)=2+4-3 \\ f(-1)=3 \end{gathered}[/tex]
The answer would be f(-1) = 3
Related Questions
During your morning workout you run for 20 seconds for every 3 seconds you sprint. Write a proportion that shows the relationship between the number of seconds you run, the number of seconds you sprint, and the constant of proportionality
Answers
During your morning workout you run for 20 seconds for every 3 seconds you sprint. Write a proportion that shows the relationship between the number of seconds you run, the number of seconds you sprint, and the constant of proportionality
In the part 1 we calculate the constant of proportionality
k=20/3
Remember that
y -----> the number of seconds you run
x -----> the number of seconds you sprint
so
The linear equation that represent the relationship between x and y is
y=(20/3)x
the proprtion is
y/x=20/3k=20/3Part 3
Rewrite the proportion as an equation to represent the number of seconds you run in terms of the number of seconds you sprint
the proportion is
y/x=20/3
frewrite as equation
y=(20/3)xWhich of the following expressions are equivalent to -19/8.(-50)?Choose all answers that apply.
Answers
To answer this question we notice the result of the original expression is positive; now, using the law of sign we notice that the negative sign in the fraction in option A will cancel out, leaving only the outer minus sign; after that if we make the product the result will be positve. This does not happens in option B, in this case the final result will be negative.
Therefore, the answer is A.
Point O is the center of this circle. What is m
Answers
If the point o is the center of the circle, then the measure of ∠CAB = 48 degrees
The point o is the center of the circle
∠COB = 96 degrees
Here we have to apply the circle theorem
The circle theorem is defined as the measure of angles joined to any point on the circumference of the circle from the same arc is equal to the one by two of the angle subtended at the center by the same arc.
Then the equation will be
∠COB = 2 × ∠CAB
Substitute the values in the equation
2 × ∠CAB = 96
∠CAB = 96 / 2
Divide the terms
∠CAB = 48 degrees
Hence, If the point o is the center of the circle, then the measure of ∠CAB = 48 degrees
Learn more about circle theorem here
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Carol is depositing $1500 into an account earning 3% compounded semiannually. How much money will be in the account after 25 years?
Answers
ANSWER
$3157.86
EXPLANATION
We have that Carol is depositing $1500 into an account earning 3% that is compounded semiannually.
The formula for amount for a compound interest is:
[tex]A\text{ = }P(1\text{ + }\frac{r}{n})^{n\cdot t}[/tex]where P = principal (amount deposited)
r = interest rate
t = number of years
n = number of times interest is compounded
Since the interest is compounded twice a year (semiannually), n = 2.
From the question:
P = $1500
r = 3% = 0.03
t = 25 years
So, the amount of money that will be there after 25 years is:
[tex]\begin{gathered} A\text{ = 1500(1 + }\frac{0.03}{2})^{2\cdot25} \\ A=1500(1+0.015)^{50} \\ \text{A = 1500(1.015)}^{50} \\ A\text{ = \$3157.86} \end{gathered}[/tex]For Items 9-11, determine the length of each segmentwith the given endpoints.9. C(1, 4) and D(11, 28)10. Y(-2, 6) and Z(5, -8)11. P(-7,-7) and Q(9,5)
Answers
Use the following formula:
d = √((x2-x1)² + (y2-y1)²)
9.
C(1,4) = (x1,y1)
D(11,28) = (x2,y2)
d = √((11-1)² + (28-4)²) = √((10)²+(24)²) = 29.73213749
10.
Y(-2,6) = (x1,y1)
Z(5,-8) = (x2,y2)
d = √((5-(-2))² + (-8-6)²) = √((7)² + (-14)²) = 15.65247584
11.
P(-7,7) = (x1,y1)
Q(9,5) = (x2,y2)
d = √((9-(-7))² + (5-(-7))²) = √((16)²+(12)²) = 20
Miguel and 3 of his friends went to the movies. They originally had a total of $40.00. Each boy had the same amount of money and spent $7.50 on a ticket. How much money did each boy have left after buying his ticket. Write and solve and equation.
Answers
Solution
Miguel and 3 of his friends went to the movies.
They originally had a total of $40.00.
Since each boy have the same amount, let the amount each boy have left after the ticket be m
The amount each boy have left is
[tex]4\times m=4m[/tex]Each boy spent $7.50 on a ticket, i.e
[tex]4\times7.5[/tex]The amount of money that each boy have left can be expressed as
[tex]\begin{gathered} 4m+4(7.5)=40 \\ 4(m+7.5)=40 \end{gathered}[/tex]Solving for m
[tex]\begin{gathered} 4(m+7.5)=40 \\ \text{Divide both sides by 4} \\ \frac{4(m+7.5)}{4}=\frac{40}{4} \\ m+7.5=10 \\ \text{Collect like terms} \\ m=10-7.5 \\ m=\text{ \$2.5} \end{gathered}[/tex]Hence, each boy have $2.5 left after buying his ticket.
Answer: $2.50 would be your answer!
Step-by-step explanation: $7.50 x 4 = 30
40$ - 30 = 10
10 ÷ 4 = 2.50
hope this helps! :)
y=20-4x. the volume of the box is V cm ^3 find in terms of x
Answers
b. The volume of a box is computed as follows:
[tex]V=\text{length}\cdot\text{width}\cdot\text{height}[/tex]Substituting with length = 3x, width = x, and heigth = y = 20 - 4x, we get:
[tex]\begin{gathered} V=3x\cdot x\cdot(20-4x) \\ V=3x^2(20-4x) \\ V=3x^2\cdot20-3x^2\cdot4x \\ V=60x^2-12x^3 \end{gathered}[/tex]c.
[tex]\frac{d}{dx}(x^n)=n\cdot x^{n-1}[/tex]Applying this rule to V, we get:
[tex]\begin{gathered} \frac{dV}{dx}=60\cdot2\cdot x-12\cdot3\cdot x^2 \\ \frac{dV}{dx}=120x-36x^2 \end{gathered}[/tex]Write a linear cost function for the following situation. Identify all variables used.A ski resort charges a snowboard rental fee of $20 plus $5.50 per hour.GLEEDIdentify all variables used. Choose the correct answer below.A. C(t) represents the number of hours the snowboard was used after renting a snowboard for t dollars.B. C(t) represents the number of snowboards that can be rented for t dollars.C. C(t) represents the cost for renting t snowboards.D. C(t) represents the cost of renting a snowboard for t hours.A linear cost function for the situation is C(t) =___(Use integers or decimals for any numbers in the expression.)
Answers
GIVEN:
We are told that a ski resort charges a snowboard rental fee of $20 plus $5.50 per hour.
Required;
Select the correct option to represent the meaning of C(t).
Also, write a linear function for the situation;
Step-by-step solution;
For the rental per hour, a fee of $5.50 is charged, which means for t number of hours, the rental would be 5.50 times t or, 5.50t. Note also that a fixed rental fee of $20 is already included regardless of how many hours rental is paid. This now means the rental would be $20 plus $5.50t.
Note that the variable t represents how many hours the snowboard was rented for. Therefore, we have;
ANSWER:
Option D:
C(t) represents the cost of renting a snowboard for t hours
A linear cost function for the situation is;
[tex]C(t)=20+5.50t[/tex]I solved part A of the problem I just need help solving part B
Answers
Given:
The function given is,
[tex]g(x)=0.009x-17.66[/tex]x represents the years.
Required:
The predicted increase in the temperature in the year 2011.
Explanation:
The predicted increase in the temperature in the year 2011 is given by,
[tex]\begin{gathered} g(2011)=0.009\times(2011)-17.66 \\ \Rightarrow g(2011)=0.439 \\ \Rightarrow g(2011)=0.4\degree \end{gathered}[/tex]Final Answer:
[tex]0.4\degree C[/tex]What is the range of the function?Type the answer using interval notation example : (#,#]
Answers
To analyze the range we need to look at the Y values. In this case the lowest Y value is 0 and the highest Y value it can go all the way up to positive infinity. So the range would be [0, +∞)
last Friday Adam had $22.33 over the weekend, she received some money for cleaning the attic period. He now had 32 dollars period, how much money did he receive.
Answers
Word Problem Leading to Simple Equation.
Last Friday Adam had $22.33 : 22.33
He received some money for cleaning: Let the amount of money he received be x, so that she now has:
[tex]22.33+x[/tex]He is left with $32, meaning his total money is now $32 :
Mathematically, we write:
[tex]\begin{gathered} 22.33+x=32 \\ \text{Collecting like terms, we get,} \\ x=32-22.33 \\ x=\text{ \$9.67} \end{gathered}[/tex]Hence, the correct answer is $9.67
Ratio of boys to girls is 6 to 5. If there are 60 girls how many boys are there?
Answers
Given that
There are 60 girls and the ratio of boys to girls is 6:5.
Explanation -
Let the boys be b.
Then the ratio can be represented in fraction form as
[tex]\begin{gathered} \frac{b}{g}=\frac{6}{5} \\ \frac{b}{60}=\frac{6}{5} \\ b=\frac{6}{5}\times60=6\times12=72 \\ So\text{ there are 72 boys.} \end{gathered}[/tex]Hence, the final answer is 72.The mean score on a Statistics exam is 88 points, with a standard deviation of 6 points. Apply Chebychev's Theorem to the data using k=2. Interpret the results.
Answers
Step 1
Given;
Step 2
State Chebychev's theorem
Thus;
[tex]\begin{gathered} k=2 \\ 1-\frac{1}{2^2}=1-\frac{1}{4}=\frac{3}{4} \end{gathered}[/tex]The empirical formula that applies to this is about 2 standard deviations of the mean
[tex]\begin{gathered} (\mu+2\sigma)\text{ and \lparen}\mu-2\sigma) \\ (88+2(6))\text{ and \lparen88-2\lparen6\rparen\rparen} \\ 100\text{ and 76} \end{gathered}[/tex]Answer;
[tex]At\text{ least 75\% of the exam scores falls between 76 and 100}[/tex]Jimmy is working at a factory where they make cars and trucks in the ratio five to four if the factory makes 100 trucks how many cars will it produce
Answers
From the basic knowledge of ratio:
cars : trucks
[tex]\begin{gathered} \frac{5}{4}\text{ = }\frac{x}{100} \\ \text{cross}-\text{ multiply,} \\ 4\text{ }\times\text{ x = 5 x 100} \\ 4x\text{ = 500} \\ \text{Divide both sides, we have:} \\ x\text{ =500/4} \\ x\text{ = 125} \end{gathered}[/tex]1. Which of the below is a binomial factor of thepolynomial shown?
Answers
The given polynomial is
[tex]\begin{gathered} 3x^2+11x+10^{} \\ \text{ By factoring completely, we obtain two paired factors 6 and 5,} \\ \text{ whose sum is 11 (the coefficient of x), and product 30 found from } \\ \text{ the product of the constant 10 and 3 (the coefficient of x}^2) \end{gathered}[/tex][tex]\begin{gathered} 3x^2+11x+10^{} \\ 3x^2+6x+5x+10 \\ 3x(x+2)+5(x+2) \\ (3x+5)(x+2) \end{gathered}[/tex]Therefore, a binomial factor of the polynomial is (x + 2) [Option A]
if ABC is an equilateral triangle and BD = 54 inches. find the value of x round to the nearest tenth
Answers
Solution
Step 1
Draw half of the given triangle
Step 2
State a known fact of an equilateral triangle to help with the question
Since the triangle is an equilateral triangle, each angle in triangle ADC = 60 degrees
Because the sum of angles in a triagle = 180 degrees and an equilateral triangle has all sides and angles equal
Therefore each angle = 180/3 = 60 degrees
so in the triangle ABD,
Step 3
Find the value of x using a trigonometric ratio
To find the length of x, we will use the trig ratio SOH(sine, opposite, hypothenuse)
[tex]\begin{gathered} \text{Sine 60 = }\frac{opposite}{\text{hypothenuse}} \\ \text{opposite}=\text{ 54inches} \\ \text{hypothenuse = x inches} \end{gathered}[/tex]
After substitution we will have that
[tex]\begin{gathered} \sin e\text{ 60 = }\frac{54}{x} \\ \text{but sine 60 = }\frac{\sqrt[]{3}}{2} \\ \frac{\sqrt[]{3}}{2}=\frac{54}{x} \\ \sqrt[]{3}x=108 \\ x\text{ =}\frac{108}{\sqrt[]{3}} \\ x\text{ =36}\sqrt[]{3} \\ x\text{ }\approx\text{62.4 inches to the nearest tenth} \end{gathered}[/tex]Therefore, x = 62.4 inches to the nearest tenth
I need help with finding the area as 8.7 as the height and I also need to know how to check the height is 8.7
Answers
The given figure is a trapezium as two sides are parallel and two are non parallel.
The parallel sides of the trapezium are a=3 mi and b=11 mi.
The height of the trapezium is h=8.7 mi.
The expression for the area of the trapezium is,
[tex]\text{Area}=\frac{1}{2}(a+b)\times h[/tex]Substituting the known values in the above expression,
[tex]\begin{gathered} \text{Area}=\frac{1}{2}(3\text{ mi+11 mil)}\times8.7\text{ mi} \\ =\frac{14\text{ mi}}{2}\times8.7\text{ mi} \\ =7\text{ mi}\times8.7\text{ mi} \\ =60.9mi^2 \end{gathered}[/tex]Thus, the required area is 60.9 square miles.
write 2.25% as fraction to the simplest form
Answers
2.25% can also be written as 0.0225 if we divide 2.25% by 100% and we eliminate the percentages:
To make the decimal 0.0225 a fraction, we have to multiply by a number in which the decimal will be an integer:
[tex]\frac{0.0225}{1}\times\frac{10000}{10000}=\frac{225}{10000}[/tex]Simplifying the fraction obtained:
[tex]\frac{225}{10000}=\frac{9}{400}[/tex]Answer:
[tex]\frac{9}{400}[/tex]Write an equation that can be used to find what ticket prices to set in order to raise $3800.If 200 adults attended and 250 children, find the cost of an adult ticket
Answers
Variables
x: cost of an adult ticket, in dollars
y: cost of a child ticket, in dollars
If 1 adult ticket is sold, then x dollars are raised. In consequence, if 200 adult tickets are sold, then 200x dollars are raised.
Similarly, if 250 child tickets are sold, then 250y dollars are raised.
Combining these amounts and raising $3800, we get:
200x + 250y = 3800
can you help me with this assignment
Answers
The two lines are said to be parallel if thier slopes are equal
where, the slope of a line is express as:
[tex]\begin{gathered} y\text{ =m(x-a)+b} \\ \text{ m is the slope} \end{gathered}[/tex]The given expression of line : y= -2x - 1
On comparing with the general equation of line, slope is
m = (-2)
A) x + 2y =-10
Simplify the general equation of line
x+2y =-10
2y=-10-x
y= -x/2 -5
Here slope is (-1/2)
So, the lines are not parallel
B) 2x-y=4
Simplify in the general equation of line
2x-y=4
y=2x-4
Here slope is 2
So, the lines are not parallel.
C)2y-x=-6
Simplify in the general equation of line
2y - x = -6
2y = x - 6
y = x/2 - 3
Here slope is 1/2
So, the lines are not parallel.
D) 2x + y =-6
Simplify in the general equation of line
2x + y =-6
y = -6 -2x
y = -2x -6
Here slope = (-2)
So, the lines are parallel.
The equation 2x + y =-6 & y= -2x - 1 have slope = (-2)
So, the lines are parallel
Answer : D) 2x + y =-6
Sylvia has 9 nickles. She wants to split the money equally between herself and two friends. How much will each person receive?
Answers
write 33_88 in simplest form
Answers
Answer
33 : 88 = 3 : 8
(33/88) = (3/8)
Explanation
33 : 88
THe best way is to do this is to divide both numbers by 11
(33/11) : (88/11)
= 3 : 8
Hope this Helps!!!
Determine the point (x, y) on the unit circle associated with the following real numbers. Write the exact answer as an ordered pair. Do not round.5xS-3
Answers
Given:
[tex]s=-\frac{5\pi}{3}[/tex]To find the point (x,y) on the unit circle:
The coordinate of the unit circle can be derived by,
[tex](\cos s,\sin s)[/tex]Substituting the value of s, we get
[tex]\begin{gathered} (\cos (-\frac{5\pi}{3}),\sin (-\frac{5\pi}{3}))=(\cos (2\pi-\frac{5\pi}{3}),\sin (2\pi-\frac{5\pi}{3})) \\ =(\cos (\frac{\pi}{3}),\sin (\frac{\pi}{3})) \\ =(\frac{1}{2},\frac{\sqrt[]{3}}{2}) \end{gathered}[/tex]Hence, the coordinate point on the unit circle is,
[tex](\frac{1}{2},\frac{\sqrt[]{3}}{2})[/tex]SLV is a 45°-45°-90° triangle with leg SV. If SV = m, determine the length ofthe other leg and the hypotenuse.
Answers
Since angles S and L are congruent, the triangle SLV is isosceles with base SL, that means SV = LV.
Since SV = m, we have LV = m
Now, to calculate the hypotenuse, we can use Pythagorean theorem:
[tex]\begin{gathered} SL^2=SV^2+LV^2 \\ SL^2=m^2+m^2 \\ SL^2=2m^2 \\ SL=m\cdot\sqrt[]{2} \end{gathered}[/tex]Artemis starts his hike at an elevation of 350 feet. He descends 60 feet, ascends 135 feet, ascends 250 feet, and finally descends 128 feet. Which equation describes his final elevation in feet? 350 + 60 + 135 + 250 + 128 = 923 B 350 + (-60) + 135 + 250 + 128 803 C 350 + (-60) + 135 + 250 + (-128) = 547 D 350 + (-60) + 135 + (-250) + 128 = 303
Answers
Total 350feet
Note descend you subtract and ascend you add
350-60+135+250-128=547
The correct option is C
complete the table of order pairsfor the given linear equationx+4y = 16x | y0 0 1
Answers
Given the equation:
[tex]x+4y=16[/tex]to find the first value, we have to make x = 0 and solve for y, then, we have the following:
[tex]\begin{gathered} x=0 \\ \Rightarrow0+4y=16 \\ \Rightarrow4y=16 \\ y=\frac{16}{4}=4 \\ y=4 \end{gathered}[/tex]then, on the first row, the value of y is 4.
For the next two, notice that we now have values for y, this means that we have y = 0 and y = 1. Solving each case for x, we get:
[tex]\begin{gathered} y=0 \\ \Rightarrow x+4(0)=16 \\ x=16 \end{gathered}[/tex]and
[tex]\begin{gathered} y=1 \\ \Rightarrow x+4(1)=16 \\ \Rightarrow x=16-4=12 \\ x=12 \end{gathered}[/tex]therefore, the table should look like this:
what is 2/13×2/4?what is 2 * 3 what is 5 * 3 hey what is the answer
Answers
When multiplying or dividingpolynomials using the Tabular Method, write the number of terms for the polynomial ax^2+bx+c
Answers
Explanation
Answer
The number of terms for the polynomial is 3
Solve the following inequality. Give the solution set in both interval and graph forms -8 less than or equal to 2x+4 less than or equal to 14
Answers
The given inequality is -8 less than or equal to 2x+4 less than or equal to 14. In written form, we have
- 8 ≤ 2x + 4 ≤ 14
The first step is to subtract 4 from the left and right hand sides. We have
- 8 - 4 ≤ 2x + 4 - 4 ≤ 14 - 4
- 12 ≤ 2x ≤ 10
Dividing through by 2, we have
- 6 ≤ x ≤ 5
10. A glass jar contains 8 red, 6 green, 12 blue, and 10 yellow marbles. If a single marble is chosen at random from the jar, what is the probability of choosing a(a) red marble? (b) green marble? (c) blue marble?
Answers
Let:
• A ,be the event of getting a red marble
,• B ,be the event of getting a green marble
,• C ,be the event of getting a blue marble
We'll have that:
[tex]\begin{gathered} P(A)=\frac{8}{36} \\ \\ P(B)=\frac{6}{36} \\ \\ P(C)=\frac{12}{36} \end{gathered}[/tex]