D + 3n = 1 Subtract d from both sides
3n = 1 - d Divide both sides by 3
n =
B, the bottom of the figure contains points E, F, and H
Kyle, d = rt, right? This means that t = d/r. If we call the rate of the current c, then her rate upstream is hindered by the current and is 3 - c. Downstream is 3 + c. The total time is 6 hours... 5/(3 - c) + 5/(3 + c) = 6 Once we put everything over the same denominator, we don't need it anymore. 5(3 + c) + 5(3 - c) = 6(3 - c)(3 + c) 15 + 5c + 15 - 5c = 54 - 6c2
30 = 54 - 6c26c2 = 24c2 = 4c = 2 2 mph
The height of a baseball thrown from the catcher to first base is modeled by the function
, where h is the height of the ball measured in feet and t is the time since being thrown, measured in seconds
To find out height of the ball at 10 seconds, we plug in 10 for t


h(10)=4.2 feet
the height of the ball at 10 seconds= 4.2 feet