Solve the motion problem.A boat moves 9 kilometers upstream in the same amount of time it moves 19 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water. (Round your answer to the nearest tenth, if necessary.)
A. 9 kilometers per hour
B. 8.1 kilometers per hour
C. 17.1 kilometers per hour
D. 25.2 kilometers per hour
Answer: D
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Find the mean. Round to the nearest tenth when necessary.The numbers of points Dee scored playing basketball over the last four games were as follows: 15, 7, 21, 15
A. Mean = 15 points B. Mean = 21.7 points C. Mean = 13 points D. Mean = 14.5 points
Find the domain of the function.y = 
A. all real numbers except 4 B. (-?, ?) C. (4, ?) D. [4, ?)
Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions.log105 + log1020
A. log10100 B. 2log1010 C. 2 D. log1025
Simplify the expression. If any variables exist, assume that they are positive and write your answer in radical notation.
? 
A. 
B. 
C. ab
D. ab