Use a double-angle identity to find the exact value of the expression.1 - 2 sin2 67.5°
A. 
B. - 
C. - 
D. 
Answer: B
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Solve the problem.An auxiliary fuel tank for a helicopter is shaped like the surface generated by revolving the curve 
- 2 ? x ? 2, about the x-axis (dimensions are in feet). How many cubic feet of fuel will the tank hold to the nearest cubic foot?
A. 2 B. 3 C. 8 D. 7
Suppose u and v are differentiable functions of x. Use the given values of the functions and their derivatives to find the value of the indicated derivative.u(2) = 7, u '(2) = 2, v(2) = -2, v '(2) = -4.
(uv) at x = 2
A. -24 B. -32 C. 32 D. 22
Provide an appropriate response.Perform the indicated operation and write the answer with positive exponent in simplest form: 
What will be an ideal response?
Solve the problem.The weight that a horizontal beam can support varies inversely as the length of the beam. Suppose that a 10-m beam can support 720 kg. How many kilograms can a 2-m beam support?
A. 0.0003 kg B. 36 kg C. 3600 kg D. 0.0278 kg