Use a half-angle formula to find the exact value of the expression.cos 
A. - 
B. - 
C. 
D. 
Answer: C
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Evaluate the integral.
A. 2 B. 3 C. 0 D. 4
Solve the problem.A water tank is formed by revolving the curve y = 2x4 about the y-axis. Find the volume of water in the tank as a function of the water depth, y.
A. V(y) = 
y3/2
B. V(y) = 
y3/2
C. V(y) = 
y1/2
D. V(y) = 
y9
Solve the problem.A square playground has a white line drawn through its diagonal. This creates two triangles whose angle measures are 45°, 45°, and 90°. If the sides of the playground are 53 feet, find the length, x, of the diagonal. Round to one decimal place if needed. 
A. 30.6 ft B. 75 ft C. 37.5 ft D. 91.8 ft
Use a table of integrals to solve the problem.The rate of growth of a microbe population is given by 
where x is time in days. What is the change in population in the first 3 days?
A. 30,272 B. 15,136 C. 60,544 D. 15,129