ciannajustine
28.08.2019 •
Mathematics
0.1 convert number to scientific notation
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Ответ:
9514 1404 393
47 mph in the rain50 mph laterStep-by-step explanation:
The speed during the first part of the trip can be represented by x. Then the speed during the second part is x+3 and the total time is ...
time = distance/speed
11 = 282/x +250/(x+3)
11(x)(x+3) = 282(x +3) +250(x) . . . . multiply by x(x+3)
11x^2 -499x -846 = 0 . . . . . . . put in standard form
(11x +18)(x -47) = 0 . . . . . . . factor
x = 47 . . . . . positive solution (makes x-47=0)
The rate of the car in the rain was 47 mph. The rate of the car after the break was 50 mph.