Let z vary jointly with x and y. Find the constant of variation k. Then, use 
to find z when x = 5 and y = 7.z = 56 when x = 
and y = 7
A. k = 15; z = 490
B. k = 14; z = 525
C. k = 48; z = 1,680
D. k = 56; z = 1,960
Answer: C
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A point on the terminal side of an angle ? is given. Find the exact value of the indicated trigonometric function of ?.(-4, 3)Find cos ?.
A. - 
B. 
C. 
D. - 
Solve the problem.Matthew has two different stocks. One of the stocks is worth $7 more per share than the other. He has 11 shares of the more valuable stock and 28 shares of the other stock. His total assets in stocks is 
How much is the more expensive stock per share?
A. $33 B. $17 C. $7 D. $31
Solve the problem.The area of a circle with radius r is given by the function A(r) = ?r2. Find the area of the base of a circular storage tank if the radius is 4 feet long. Use ? ? 3.14.
A. 50.24 square feet B. 25.12 square feet C. 48 square feet D. 12.56 square feet
Solve the equation.log2(x) = -2
A. 
B. 0
C. 
D. -4