Translate to a proportion and solve. 80 is what percent of 160?
A. 200%
B. 100%
C. 40%
D. 50%
Answer: D
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Solve by the method of elimination by substitution.x + 8y = 0x - 8y = 80
A. x = 40, y = 5 B. x = 8, y = -1 C. x = 40, y = -5 D. x = -5, y = 40
Insert parentheses, if needed, to make the expression on the left equal to the number on the right.48 ÷ (-3) - 1 - 9 = -21
A. 48 ÷ (-3) - 1 - 9 = -21 B. 48 ÷ (-3) - (1 - 9) = -21 C. 48 ÷ (-3 - 1) - 9 = -21 D. 48 ÷ (-3 - 1 - 9) = -21
Multiply, and then simplify if possible. Assume all variables represent positive real numbers.
(
+ 
)
A. 5
+ 5
B. 25
+ 5
C. 15 + 25
D. 5
+ 25
Find a formula for the inverse of the function described below.A size 8 dress in Country C is size 48 in Country D. A function that converts dress sizes in Country C to those in Country D is 
A. f-1(x) = 
B. f-1(x) = 
+ 16
C. f-1(x) = x - 16
D. f-1(x) = 
- 16