Provide an appropriate response. A boat moves 5 kilometers upstream in the same amount of time it moves 16 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water.
A. 9 km/hr
B. 17
km/hr
C. 4
km/hr
D. 7
km/hr
Answer: B
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Perform the indicated division and find a simplified expression.The average velocity of a certain particle in feet per second is given by 
A. 2t2 + 3t - 4
B. 2t2 + 3t - 5 + 
C. 2t2 - 4t + 3 + 
D. 2t2 - 3t - 4
Solve the problem. Round results to an appropriate number of significant digits.When sitting atop a tree and looking down at his pal Joey, the angle of depression of Mack's line of sight is 
If Joey is known to be standing 26 ft from the base of the tree, how tall is the tree?
A. 38 ft B. 40 ft C. 42 ft D. 36 ft
Solve the problem.If an object is dropped from a tower, then the velocity, V (in feet per second), of the object after t seconds can be obtained by multiplying t by 32 and adding 10 to the result. Find V as a linear function of t, and use this function to evaluate V(7.9), the velocity of the object at time 
A. V(7.9) = 264.1 ft per sec B. V(7.9) = 260.8 ft per sec C. V(7.9) = 262.1 ft per sec D. V(7.9) = 262.8 ft per sec
For the function f, construct and simplify the difference quotient 
.f(x) = 4|x| + 9x
A. -8h
B. 
C. -10h
D. 