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N76 [4]
3 years ago
13

Expand the expression (r-4)(8)

Mathematics
1 answer:
Gnom [1K]3 years ago
7 0

R - 4 x 8 is the expanded expression

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Write a story that can be represented by the equation<br> y=x+<br> 5*.
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2 years ago
If the maximum acceleration that is tolerable for passengers in a subway train is 1.74 m/s2 and subway stations are located 930
Free_Kalibri [48]
Given that the subway stations are 930 m apart, the train have to be accerelated for half the distance and then decerelated for the rest of the distance.

Recall that the distance travelled by an object with an initial velocity, u, for a period of time, t, at an accereration, a, is given by
s=ut+ \frac{1}{2} at^2

But, we assume that the train accelerates from rest, thus
s=\frac{1}{2} at^2 \\  \\ \Rightarrow465=\frac{1}{2}(1.74)t^2 \\  \\ \Rightarrow t^2=534.48 \\  \\  \Rightarrow t=\sqrt{534.48}=23.12

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Step-by-step explanation:

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yawa3891 [41]
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