Solve the problem.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 5% cement should he mix with 10 bags of 17% cement to produce a mix containing 11% cement?
A. 10 bags
B. 12 bags
C. 25 bags
D. 20 bags
Answer: A
Mathematics
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Evaluate the expression according to the replacement value given.xy ÷ 4; replace x with 16 and y with 8.
A. 96 B. 128 C. 32 D. 64
Mathematics
Find the standard deviation of the data summarized in the given frequency table.The heights of a group of professional basketball players are summarized in the frequency table below. Find the standard deviation. Round your answer to one decimal place. 
A. 2.9 B. 2.8 C. 3.3 D. 3.2
Mathematics
Provide the proper response.If two nonvertical lines have the same slope, they are
Fill in the blank(s) with the appropriate word(s).
Mathematics
Find the equation of the parabola described.Directrix the line y = 3; vertex at (0, 0)
A. y2 = -12x B. x = 3y2 C. x2 = -12y D. y = -12x2
Mathematics