Solve the variation problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 19 minutes requires 15.2 gallons of water. Find the amount of water used in a shower lasting 12 minutes.
A. 8.8 gallons
B. 9.6 gallons
C. 10.4 gallons
D. 228 gallons
Answer: B
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Find the value of the objective function at each corner of the graphed region. Use this information to answer the question. 
Objective Functionz = -x - 9yWhat is the maximum value of the objective function?
A. -30 B. -38 C. -47 D. -22
Simplify the difference quotients 
and 
for the following function. Rationalize the numerator when necessary.f(x) = 5x + 3
A. 5; 5x - 5a B. 5x - 5h; 5x - 5a C. 5h; 5a D. 5; 5
Identify the equation as either an identity or not.
= 
A. Identity B. Not an identity
Determine whether the scatter diagram indicates that a linear relation may exist between the two variables. If a linear relation does exist, indicate whether the slope is positive or negative.
A. Linear with negative slope B. Nonlinear C. Linear with positive slope