A cyclist travels 45 miles in 3 hours. What is the cyclist's speed?

Hint: Use the formula: d = r x t (distance = rate x time)

Remember that division and multiplication are INVERSE operations. So, 45 = r x 3

so you will have to divide the distance by the time to get the rate.

45 ÷ 3 to find the rate

A: 15 miles per hour

B: 12 miles per hour

C: 16 miles per hour

15

Step-by-step explanation:

you would divide 45 and 3 to get 15 miles per hour

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

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