WGU C957 APPLIED ALGEBRA OA EXAM
Complete Exam Questions and correct answer
with rationales.
You own a car wash that charges $10 for each car that goes through. If you wash 50
cars a day, your revenue is $10×50=$500. If you only wash 20 cars a day, your revenue
is $10×20=$200.
Which variable is the independent variable?
A. Your company's revenue
B. The number of cars washed ✔✔CORRECT ANSWERS✔✔B
The amount of money you spend on apps depends on the number of apps you buy.
Which variable is the dependent variable?
A. The amount of money spent
B. The number of apps you buy ✔✔CORRECT ANSWERS✔✔A
When you first started at your job, you earned two weeks of vacation time a year.
After five years of employment, you earn three weeks of vacation. After ten years of
employment, you earn four weeks of vacation.
What is the dependent variable—the number of weeks of vacation or the number of
years employed?
,A. The number of weeks of vacation
B. The number of years employed ✔✔CORRECT ANSWERS✔✔A
Which event allows you to predict the output based on an input?
A. The sex of a baby based on what the mother eats during pregnancy
B. The color gumball you get from a gumball machine based on which quarter you put
into the machine
C. Whether or not someone will opt into a retirement savings program based on eye
color
D. What comes out of a vending machine based on your selection ✔✔CORRECT
ANSWERS✔✔D
A cow eats grass, which is turned into milk by its body, and a farmer then milks the
cow.
What is the input?
A. The cow
B. The milk
C. The grass
D. The farmer ✔✔CORRECT ANSWERS✔✔C
Which of these represents a function?
A. Input: A student's age; Output: The number of siblings a student has
, B. Input: The cost of an item; Output: The sales tax owed on the item
C. Input: A teacher's gender; Output: Subject he or she teaches
D. Input: The amount of coffee consumed; Output: Level of intelligence ✔✔CORRECT
ANSWERS✔✔B
A company uses the function B to predict the cost of benefits given the number of
employees, n.
What might the inverse function be useful for?
A. The inverse function could be used to figure out how many employees the company
could employ if the budget for benefits was limited.
B. The inverse function could be used to predict the cost of benefits for new hires.
✔✔CORRECT ANSWERS✔✔A
A function doubles each input. What does the inverse function do?
A. Doubles each input
B. Adds 2 to each input
C. Subtracts 2 from each input
D. Halves each input ✔✔CORRECT ANSWERS✔✔D
Sales tax in your state is 7%.
Which function models the amount of sales tax, T, when you spend x dollars?
A. T(x)=7+x
B. T(x)=0.07+x
Complete Exam Questions and correct answer
with rationales.
You own a car wash that charges $10 for each car that goes through. If you wash 50
cars a day, your revenue is $10×50=$500. If you only wash 20 cars a day, your revenue
is $10×20=$200.
Which variable is the independent variable?
A. Your company's revenue
B. The number of cars washed ✔✔CORRECT ANSWERS✔✔B
The amount of money you spend on apps depends on the number of apps you buy.
Which variable is the dependent variable?
A. The amount of money spent
B. The number of apps you buy ✔✔CORRECT ANSWERS✔✔A
When you first started at your job, you earned two weeks of vacation time a year.
After five years of employment, you earn three weeks of vacation. After ten years of
employment, you earn four weeks of vacation.
What is the dependent variable—the number of weeks of vacation or the number of
years employed?
,A. The number of weeks of vacation
B. The number of years employed ✔✔CORRECT ANSWERS✔✔A
Which event allows you to predict the output based on an input?
A. The sex of a baby based on what the mother eats during pregnancy
B. The color gumball you get from a gumball machine based on which quarter you put
into the machine
C. Whether or not someone will opt into a retirement savings program based on eye
color
D. What comes out of a vending machine based on your selection ✔✔CORRECT
ANSWERS✔✔D
A cow eats grass, which is turned into milk by its body, and a farmer then milks the
cow.
What is the input?
A. The cow
B. The milk
C. The grass
D. The farmer ✔✔CORRECT ANSWERS✔✔C
Which of these represents a function?
A. Input: A student's age; Output: The number of siblings a student has
, B. Input: The cost of an item; Output: The sales tax owed on the item
C. Input: A teacher's gender; Output: Subject he or she teaches
D. Input: The amount of coffee consumed; Output: Level of intelligence ✔✔CORRECT
ANSWERS✔✔B
A company uses the function B to predict the cost of benefits given the number of
employees, n.
What might the inverse function be useful for?
A. The inverse function could be used to figure out how many employees the company
could employ if the budget for benefits was limited.
B. The inverse function could be used to predict the cost of benefits for new hires.
✔✔CORRECT ANSWERS✔✔A
A function doubles each input. What does the inverse function do?
A. Doubles each input
B. Adds 2 to each input
C. Subtracts 2 from each input
D. Halves each input ✔✔CORRECT ANSWERS✔✔D
Sales tax in your state is 7%.
Which function models the amount of sales tax, T, when you spend x dollars?
A. T(x)=7+x
B. T(x)=0.07+x
