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Show Examples A new car is purchased for 20300 dollars. The value of the car depreciates at 8.75% per year. What will the value of the car be, to the nearest cent, after 12 years? Answer
□
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Use the definition of a one-to-one function to determine if the function is one-to-one.
k(x)=∣x−1∣
The function is one-to-one.
The function is not one-to-one.
Jada was solving the equation 6−x=−16. She was about to square each side, but then she realized she could give an answer without doing any algebra. What did she realize?
Question 6 of 9, Step 1 of 1
4/11
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1 The function C(t)=C0(1+r)t models the rise in the cost of a product that has a cost of C0 today, subject to an average yearly inflation rate of r for t years. If the average annual rate of inflation over the next 11 years is assumed to be 3.5%, what will the inflation-adjusted cost of a $18,100 car be in 11 years? Round to two decimal places.
There are 35 nickels on one pan of a pan balance and 26 nickels on the other. To make the pans balance, Levi thinks 5 nickels should be added to the higher pan, Isaac thinks 8 nickels should be added, and Miranda thinks 9 nickels should be added. Use the equation 35=26+n to determine who is correct.
□ is correct because the value □ makes the equation □
Use the function below to answer the following questions.
n(x)=−ex+3
(a) Use transformations of the graph of y=ex to graph the given function.
(b) Write the domain and range in interval notation.
(c) Write an equation of the asymptote. Part: 0/3 Part 1 of 3
Use the function below to answer the following questions.
m(x)=5x+4
(a) Use transformations of the graph of y=5x to graph the given function.
(b) Write the domain and range in interval notation.
(c) Write an equation of the asymptote. Part: 0/3
Solve by completing the square.
−3v2+48v−75=0 言A Write your answers as integers, proper or improper fractions in simplest form, or cimals rounded to the nearest hundredth.
) [ix x˙A]=□ or v=□
Solve the system by using the addition method.
4x2+y26x2−4y2=37=50
There are infinitely many solutions.
The solution set is the empty set, }.
The solution set is a finite set.
The solution set is □ \}
3. The population of the People's Republic of China has been doubling approximately every sixty years. The population in 1975 was about 824000000 . If the current growth rate continues, what will the population be in 2215?
6. (04.02 MC) A gym offers regular memberships for $80 per month and off-peak memberships for $60 per month. Last month, the gym sold a total of 420 memberships for a total of $31,100. The following system of equations models this scenario:
80x+60y=31,100x+y=420 How many of the memberships sold were regular memberships? (1 point)
125
140
235
295
Find the number of solutions by graphing the system of equations. Select "None" if applicable. (Hint: Rewrite the system of equations into familiar forms to graph.)
ln7=2lnx−lnyx2+y2−6y+8=0 Number of solutions: □
None
Quadratic and Exponential Functions
Graphing a parabola of the form y=ax2+bx+c : Integer coefficier
aph the parabola.
y=3x2−30x+69 Plot five points on the parabola: the vertex, two points to the le button.
e graph of a rational function f is shown below.
Assume that all asymptotes and intercepts are shown and that the graph has no "holes".
Use the graph to complete the following.
(a) Write the equations for all vertical and horizontal asymptotes. Enter the equations using the "and" button as necessary. Select "None" as necessary. Vertical asymptote(s):
x=−1 Horizontal asymptote(s): □
(b) Find all x-intercepts and y-intercepts. Check all that apply. x-intercept(s): □−1−3□ - 6 □ None
y-intercept(s): □−6□−2□−3 None
(c) Find the domain and range of f. Write each answer as an interval or union of intervals.
Domain: □
Range: □
4) Let f(x)=3x+2,g(x)=x2+2x+1, and h(x)=x−12x+1
a) Find and simplify (g∘f)(x),(f∘g)(x),(f∘f)(x).
b) Find f−1 and show that the function you found is indeed the inverse of f(x)
c) h(x),x=1 is one-to-one. Find its inverse and check the result.
hmic Functions
Question 11, 5.4.67 Solve the equation. Use the change of base formula when appropriate.
e−x=18 Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. x=□ (Type an integer or decimal rounded to the nearest hundredth as needed.)
B. There is no solution.
Using Descartes' Rule of Signs, what can be said about the following polynomial: x3−4x2+7x−10 ?
Since there are two negatives and one positive, there will be only two negative roots.
Since there are an even amount of positive and negative signs, there is no solution.
Since there is only one variable ( x ), there will be fewer than three answers.
There are three sign changes, meaning this polynomial has up to three positive roots.
unctions
Question 13, 5.4.71 Solve the equation.
105x=10000 Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. The solution is x=□ . (Type an integer or a fraction.)
B. There is no solution.
14. This year, a rancher counted 225 horses on the range. This count is 22 fewer than last year. How many horses did the rancher count last year? Let h be the number of horses counted last year. Solve h−22=225 to find the number of horses counted last year.
Equations
Points: 0 of 1 Find a polynomial function of least degree having only real coefficients, a leading coefficient of 1 , and roots of 2−6,2+6, and 7−i. The polynomial function is P(x)=□
(Simplify your answer.)
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Part 3 of 3
Points: 0.67 of 1 For the function shown below, complete the following.
f(x)=x3−2x2−9x+18
a. List all possible zeros.
b. Use synthetic division to test the possible rational zeros and find an actual zero.
c. Use the quotient from part (b) to find the remaining zeros of the polynomial function.
a. List all possible rational zeros.
±1,±2,±3,±6,±9,±18
(Use a comma to separate answers as needed.)
b. Use synthetic division to test the possible rational zeros and find an actual zero. One of the actual rational zeros is 2 .
c. Use the quotient from part (b) to find the remaining zeros of the polynomial function. Then write all of the zeros of the function. The solution of f(x)=x3−2x2−9x+18 is □
(Type exact answers, using radicals as needed. Use a comma to separate answers as needed.)
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Feng invests money in an account paying simple interest. He invests $70 and no money is added or removed from the investment. After one year, he has $70.70. What is the simple percent interest per year? Answer
□ \%
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6. Form a polynomial f(x) with real coefficients having the given degree and zeros. Degree 4 ; zeros: 4 , multiplicity 2;6i
Enter the polynomial. Let a represent the leading coefficient.
f(x)=a(
])
□
(Type an expression using x as the variable. Use integers or fractions for any numbers in the
Amelia invests money in an account paying simple interest. She invests $100 and no money is added or removed from the investment. After one year, she has $101. What is the simple percent interest per year? Answer
□ \%
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Two trains leave the station at the same time, one heading west and the other east. The westbound train travels 16 miles per hour slower than the eastbound train. If the two trains are 540 miles apart after 3 hours, what is the rate of the westbound train? Do not do any rounding.
□
7 miles \$er hour
2. Luke, Obi-Wan and Yoda are collecting light sabers for their collections. Together, they have 11 light sabers. The number of light sabers Luke has combined with 2 times the number Obi-Wan has equals three less than three times the number Yoda has. Four times the number Obi-Wan has combined with three times the number Yoda has is the same as four times as many as Luke. How many light sabers does each person have? Luke: light sabers Obi-wan: light sabers Yoda: light sabers
Question 2, 10.6.10 HW Score: 0%,0 of 10 points
Points: 0 of 1 Use the ordinary annuity formula shown to the right to determine the accumulated amount in the annuity if $80 is invested semiannually for 35 year 6.5% compounded semiannually.
Find a possible formula for the function graphed below. The x-intercepts are marked with points located at (5,0) and (−4,0), while the y-intercept is marked with a point located at (0,−35). The asymptotes are y=−1,x=−3, and x=4. Give your formula as a reduced rational function.
f(x)=□ help (formulas)
(Click on graph to enlarge)
Which of the formulas below could be a polynomial with all of the following properties: its only zeros are x=−6,−3,2, it has y-intercept y=3, and its long-run behavior is y→−∞ as x→±∞ ? Select every formula that has all of these properties.
A. y=−1083(x+6)(x+3)2(x−2)
B. y=−9723(x+6)(x+3)4(x−2)
(i)
C. y=−363(x+6)(x+3)(x−2)
D. y=−3x(x+6)(x+3)(x−2)
E. y=723(x+6)(x+3)(x−2)2
F. y=−723(x+6)(x+3)(x−2)2
G. y=−2163(x+6)2(x+3)(x−2)
A small bicycle manufacturer has daily fixed costs of $1992 and each bicycle costs $76 to manufacture. Let x represent the number of bicycles manufactured and C(x) represents the cost of manufacturing. Complete parts (a) through (c).
(a) Write a linear function that models this situation.
C(x)=□
The graph of the equation representing compound interest is that of:
A. linear function.
B. quadratic function.
C. exponential function.
D. None of the above
A package of silicone straws costs $6. This is $7 less than the cost of a package of metal straws. Select the equations that could be used to find the cost c of th package of metal straws.
A) 7=c÷6
B) c−7=6
C) c×7=6
D) 6+7=c
E) −6+7=c
In 2010, a laptop computer was purchased for $2050. Each year since, the resale value has decreased by 24%.
Let t be the number of years since 2010. Let y be the value of the laptop computer, in dollars.
Write an exponential function showing the relationship between y and t.
□
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allowed A bowling alley can be hired for a party. The formula below shows the cost.
A party cost £316. How many people were at the party?
A cereal company is developing a new granola bar. It follows a recipe based on the graph shown below. 1. What is the constant of proportionality? 2. Explain what the constant of proportionality means for this example. Your response should mention "nuts" and "fruit". 3. How many cups of nuts would be needed for 10 cups of fruit? Show or explain how you know. 4. How many cups of fruit would be needed for 9 cups of nuts? Show or explain how you know. 5. Make a table of the graph above. Include at least five pairs of values.
Use the quotient rule to simplify. Assume that all variables represent positive real numbers.
381y127x381y127x=□
(Type an exact answer, using radicals as needed. Simplify your answer.)
A hot dog stand sells hot dogs for $3 each.
a. Write a linear equation to represent the total income, I, the stand makes based on the number of hot dogs sold, h.
b. What is the income if 150 hotdogs are sold?
c. How many hotdogs to earn $2200.
The number of bacteria in a certain population is predicted to increase according to a continuous exponential growth model, at a relative rate of 8% per hour. Suppose that a sample culture has an initial population of 522 bacteria. Find the population predicted after six hours, according to the model. Do not round any intermediate computations, and round your answer to the nearest tenth.
□ bacteria
Check here for instructional material to complete this problem.
Let a be the length of a snowboard, and let b be length of the bag needed to hold it. Identify the independent variable and the dependent variab For the variables b and a , identify the independent variable and the dependent variable.
A. The variable a is the independent variable and variable b is the dependent variable.
B. The variable a is the dependent variable and variable b is the independent variable.
9) Perform the following transformations of
h(x)=x21
(write your resulting equation in every step below):
a) Shift h(x) up 3 units.
b) Shift the result of a) left 2 units.
c) Reflect the result of b) about the x-axis.
d) Reflect the result of c) about the y-axis.
10) Perform the transformations of Problem 9 applied to the functions f(x)=e2x and g(x)=lnx. Sketch the resulting graphs.
Identify the property that justifies the statement z(2w+y)=(2w+y)z.
A associative property of multiplication
B commutative property of multiplication
C multiplication property of equality
D symmetric property of equality
3) Which answer choice best describes the end behavior of the graph of y=3(31)x+2 ? You need to sketch the graph to answer.
(1) x→∞,f(x)→0
(3) x→∞,f(x)→2x→−∞,f(x)→∞x→−∞,f(x)→∞
(2) x→∞,f(x)→−∞
(4) x→∞,f(x)→∞x→−∞,f(x)→0x→−∞,f(x)→2
Show that the given functions are inverse functions of each other. Then display the graphs of each function and the line y=x on a graphing calculator and note that each is the mirror image of the other across y=x.
y=10x/2 and y=2log10x Transform the function y=10x/2 to show that it is the inverse of y=2log10x.
y=10x/2→□□
Given the sequential instructions below. Identify the instructions suitable for parallelism and those that are not suitable.
i. e=a+b
ii. p=f+c
iii. f=c+d
iv. g=e∗f
71 Soit Sn la somme définie pour tout n∈N par Sn=1+5+52+53+…+5n. 1. Exprimer Sn en fonction de n. 2. Déterminer limite de Sn quand n tend vers +∞ en justifiant.
(3.) The equation p(h)=5,000⋅2h represents a bacteria population as a function of time in hours. Here is a graph of the function P,
(4.) Use the graph to determine when the population will reach
100,000
D. Explain why log220 also tells us when the population will reach 100,000 , 4. Solve 9⋅10(0.2t)=900. Show your reasoning.
5 Honors
Question 1, 6.0.60
Points: 0 of 1 Determine the smallest number both the numerator and denominator should be multiplied by to rationalize the denominator of the radical expression.
332
4. Given the line whose equation is 2y−6x=10, for every one unit of increase in x, which of the following is true about y ? (Hint, rearrange into y=mx+b form first.)
(1) y decreases by 6
(2) y increases by 3
(3) y increases by 2
(4) y decreases by 10