Find an equation of variation in which y varies directly as x and the following is true.y = 0.9, when x = 0.4
A. y = 
B. y = 
x
C. y = 0.9x
D. y = 
x
Answer: D
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Find the extreme values of the function subject to the given constraint.
A. Maximum: 30 at 
minimum: 24 at 
B. Maximum: none; minimum: 24 at 
C. Maximum: none; minimum: 30 at 
D. Maximum: 51 at 
minimum: 30 at 
Find the indicated directed path.Find a directed path from "A to C". 
A. "ADBEC" B. "ADEC" C. "AC" D. "ADC"
Solve the problem.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 700 pounds of the material are placed in the vault, how much time will need to pass for only 431 pounds to remain?
A. 80 yr B. 140 yr C. 70 yr D. 75 yr
Simplify the expression algebraically.
What will be an ideal response?