Solve the problem.A rescue cable attached to a helicopter weighs 2 lb/ft. A 200-lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done in lifting the man if the helicopter is 30 ft above the water?
A. 6060 ft ? lb
B. 6900 ft ? lb
C. 7800 ft ? lb
D. 1100 ft ? lb
Answer: B
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Multiply. Write a mixed numeral for the answer.4 ? 5
A. 21
B. 20
C. 20
D. 20
Use a proportion to solve the problem.The ratio of the lengths of strings that play the notes D and A is 3 to 2. If a string 96 centimeters long plays a D, what is the length of the string that plays an A?
A. 98 centimeters B. 144 centimeters C. 64 centimeters D. 99 centimeters
Solve the equation.x3 + x2 - 30x = 0
A. {-6, -5, 0} B. {-5, 0, 6} C. {0, 5, 6} D. {-6, 0, 5}
Solve the problem.The number of books in a small library increases according to the function B = 5200e0.02t, where t is measured in years. How many books will the library have after 8 years?
A. 4139 books B. 6102 books C. 7516 books D. 9529 books