Simplify. Write your answer in the form a + bi, where a and b are real numbers.Let z = 2 - 4i and w = 2 + 7i. Find zw.
A. 32 + 6i
B. 32 - 6i
C. -28i2 + 6i - 4
D. -24 - 22i
Answer: A
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Solve by the method of your choice.x3 + y = 05x2 - y = 0
A. {(0, 0), (5, -125)} B. {(0, 0), (-5, 125)} C. {(0, 0), (-5, 25)} D. {(-1, 1), (-5, 125)}
Solve the problem.A charter flight charges a fare of $210 per person plus $5 per person for each unsold seat on the plane. If the plane holds 142 passengers and if x represents the number of unsold seats, an expression for the total revenue received for the flight is 
Determine the number of unsold seats that will produce the maximum revenue.
A. 45 B. 100 C. 50 D. 55
Solve.The pressure of a gas varies jointly as the amount of the gas (measured in moles) and the temperature and inversely as the volume of the gas. If the pressure is 
(kiloPascals) when the number of moles is 5, the temperature is 
, and the volume is 
, find the pressure when the number of moles is 6, the temperature is 
, and the
volume is 
.
A. 1320
B. 792
C. 726
D. 1452
Solve the formula for the specified letter.P = 
for r
A. r = 
B. r = P - tA
C. r = 
D. r = 