Factor by grouping.x3 - 5x2 - 8x + 40
A. (x2 - 8)(x - 5)
B. (x2 - 5)(x - 8)
C. (x3 - 8)(x + 5)
D. (x2 + 8)(x - 5)
Answer: A
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Use the vertical line test to determine whether or not the graph is a graph in which y is a function of x.
A. not a function B. function
Solve the equation.e3x - 1 = (e4)-x
A. 
B. 
C. 
D. {0}
Write a proportion that models the situation described. Then, solve the proportion for x.If 3.3 ounces of oil are to be added to 23.1 gallons of gasoline, then x ounces of oil should be added to 51.1 gallons of gasoline.
A. 
= 
; x = 357.7 ounces
B. 
= 
; x = 7.2 ounces
C. 
= 
; x = 7.5 ounces
D. 
= 
; x = 7.3 ounces
Use the given information to answer the question.The number N, in millions of Americans of age x with arthritis, is estimated with the following graph. 
What approximate age (closest integer) has the most arthritic Americans?
A. 21 B. 88 C. 65 D. 60