Rationalize the denominator. Assume all variables represent positive real numbers.
A. 
B. 7
C. 
D. 
Answer: D
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Solve the problem.A rescue cable attached to a helicopter weighs 2 lb/ft. A 160-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. 4860 ft ? lb B. 5700 ft ? lb C. 1060 ft ? lb D. 6600 ft ? lb
Solve the problem.A thermometer reading 8°C is brought into a room with a constant temperature of 25°C. If the thermometer reads 18°C after 4 minutes, what will it read after being in the room for 10 minutes? Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.(Round your answer to two decimal places.)
A. -7.95°C B. 26.85°C C. 23.15°C D. 25°C
Perform the indicated operations. Write the answer in simplest form.
÷ 
A. 
B. 
C. 
D. 
Identify the polynomial as a monomial, binomial, trinomial, or none of these. Give its degree.-12y4 - 6y3 - 7
A. Trinomial, degree 4 B. Trinomial, degree 7 C. Trinomial, degree 8 D. Binomial, degree 4