Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°
A. 
B. 
C. - 
D. - 
Answer: B
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Solve the problem.A 15-kg mass is attached to a spring that hangs vertically and is stretched 2 m from the equilibrium position of the spring. Assume a linear spring with F(x) = kx. How much work is required to stretch the spring and lower the mass 1.5 m? Round to four decimal places when appropriate.
A. 248.0625 J B. 303.1875 J C. 523.6875 J D. 27.5625 J
Determine which state is more poorly represented.State A with a population of 489,798 and 9 representatives or state B with a population of 323,994 and 11 representatives.
A. State A B. State B C. The two have equal representation.
Evaluate the integral.
A. - 
cos5 ? + C
B. - 
cos4 ? + C
C. 
cos3 ? + C
D. 
cos2 ? + C
Use integration by parts to establish a reduction formula for the integral.
A. 
= - 2xn-1 e- x2 - 2(n - 1) 
B. 
= n xn-1 e- x2 + 2n 
C. 
= - 
xn e- x2 + 
D. 
= - 
xn-1 e- x2 + 
