Solve the problem.A chemist needs 60 milliliters of a 45% solution but has only 39% and 57% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 20 mL of 39%; 40 mL of 57%
B. 50 mL of 39%; 10 mL of 57%
C. 40 mL of 39%; 20 mL of 57%
D. 10 mL of 39%; 50 mL of 57%
Answer: C
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Find the volume of the described solid.The base of a solid is the region between the curve y = 6cos x and the x-axis from x = 0 to x = ?/2. The cross sections perpendicular to the x-axis are isosceles right triangles with one leg on the base of the solid.
A. 
?
B. 9?
C. 
?
D. 3?
Solve the problem.For what value of x is the tangent to the curve of y = 11x - x2 parallel to the x-axis?
A. x = 5 B. x = 10 C. x = 1 D. x = 5.5
Refer to the figures and recursive rules below to answer the following question(s).
Which of the figures above approximates the result of recursively applying Rule C infinitely many times?
A. Figure 2 B. Figure 4 C. Figure 1 D. Figure 3 E. none of these
Solve the problem.A ball is thrown downward from a window in a tall building. Its position at time t in seconds is given by 
where s is in feet. How long will it take the ball to fall 
Round to the nearest tenth, if necessary.
A. 3.6 sec B. 1.9 sec C. 2.7 sec D. 1.7 sec