(9x2 - 8x + 4) - (4x2 + 3x - 9) A. 13x2 - 11x + 5 B. 13x2 - 11x + 13 C. 5x2 - 5x + 13 D. 5x2 - 11x + 13
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Recall your d = rt.
so hmm is about the same as the other one... so say the boat has a speed rate of "b", well, going downstream the boat goes say " b + 2 ", because the current is adding to it, and going upstream is " b - 2 " because the current is eroding from it.
So if the whole trip took 14 hours, say it took "t" hours going upstream, then going downstream it took the slack or " 14 - t ".
Also notice, the trip forth and back is the same 45 miles.
so hmm is about the same as the other one... so say the boat has a speed rate of "b", well, going downstream the boat goes say " b + 2 ", because the current is adding to it, and going upstream is " b - 2 " because the current is eroding from it.
So if the whole trip took 14 hours, say it took "t" hours going upstream, then going downstream it took the slack or " 14 - t ".
Also notice, the trip forth and back is the same 45 miles.