Solve the problem.A boat moves 5 kilometers upstream in the same amount of time it moves 20 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. 3 km/hr
C. 15 km/hr
D. 6
km/hr
Answer: C
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Subtract.
A. 3,833 B. 3,913 C. 3,917 D. 83
Solve the equation.9x + 4 = 5x + 40
A. x = -9 B. x = -10 C. x = 9 D. x = 10
If a projectile is fired with an initial speed of  figure 1.png)
ft/s an angle ? above the horizontal, then its position after t seconds is given by the parametric equations  figure 2.png)
and  figure 3.png)
where x and y are measured in feet.
Suppose a gun fires a bullet into the air with an initial speed of 1024 ft/s at an angle of 30° to the horizontal. What is the maximum height attained by the bullet?
Write standard notation for the number in the sentence.The distance between two stars is four trillion, three hundred seventeen billion, nine hundred eighty-eight million miles.
A. 4,317,988,000 B. 4,317,988,000,000 C. 4,317,988 D. 4,317,988,000,000,000