Find the average value of the function f over the given region.f(x, y) = sin 3(x + y); R = 
A. 
B. 
C. 4?2
D. ?2
Answer: A
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Find the standard-form equation of the hyperbola centered at the origin which satisfies the given conditions.Foci at (0, -25), (0, 25); asymptotes: y = 
x, y = - 
x
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Solve.The price of a printer was reduced from $400 to $300. What was the percent of decrease?
A. 33.3% B. 30% C. 25% D. 75%
Divide and simplify.
÷ 
A. 
B. 
C. 
D. 
Solve the problem.The formula A = P + Prt represents the value, A, of an investment of P dollars at a yearly simple interest rate, r, for t years. The equation to model the value, A, of an investment of $97 at 5.15% for t years is given by A = 97 + 5t. The equation to model the value, A, of an investment of $101 at 3.96% for t years is given by A = 101 + 4t. Assuming A has the same value, the given equations form a system of two linear equations. Solve this system using an algebraic approach and interpret your answer.
A. t = 5; The two investments will reach the same value in 5 years. B. t = 400; The two investments will reach the same value in 400 years. C. t = 4; The two investments will reach the same value in 4 years. D. t = 8; The two investments will reach the same value in 8 years.