Atrain travels at a constant rate of 45 miles per hour.

a. what is the distance, d, in miles, that the train travels in t hours?

b. how many miles will it travel in 2.5 hours?
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Ok so for a. we will make a equation representing the distance the train travels in t hours:

We know that it travels 45 miles PER hour, so that is representing by 45(t).

d is the distance. So the equation is    d = 45(t)

For part b. we substitute 2.5 in the t part of the equation. Then we solve

d = 45(2.5)
45 * 2.5 = 112.5

So it will travel 112.5 miles in 2.5 hours

Do you need with the x value for the minimum? its always between the two intercepts for a parabola