Solve.In a state with a population of 9,000,000 people, the average citizen spends $6,000 on housing each year. What is the total spent on housing for the state? Write your answer in scientific notation.
A. $5.4 × 1010
B. $5.4 × 109
C. $54 × 1010
D. $54 × 1011
Answer: A
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Add and simplify.
A. 2
B. 1
C. 3
D. 3
Solve the problem.Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 2% and the rest at 3.25%. He made a total of $237.50 in interest. How much was invested at 3.25%?
A. $7000 B. $5000 C. $3000 D. $8000
The initial tableau of a linear programming problem is given. Use the simplex method to solve the problem. 
A. Maximum at 30 for x2 = 10, s1 = 15 B. Maximum at 12.5 for x2 = 7.5, s2 = 5 C. Maximum at 45 for x2 = 15, s2 = 10 D. Maximum at 25 for x2 = 15, s1 = 10
Solve the problem.A deep sea diving bell is being lowered at a constant rate. After 8 minutes, the bell is at a depth of 500 feet. After 30 minutes the bell is at a depth of 1800 feet. What is the average rate of lowering per minute? Round your answer to the nearest tenth.
A. 0.02 ft per min B. 59.1 ft per min C. 43.3 ft per min D. 60.0 ft per min