1. A marathon runner runs 10 1/2 miles in 2
hours. What is her rate?

5.25 miles/hour

Step-by-step explanation:

You take the distance / time

if it is hours her rate is 5.25 miles an hour and if it’s minutes it’s .0875 miles per minute

Step-by-step explanation:

Just do 10.5 divided by 2 or 10.5 divided by 120 for seconds

answer: sorry but i need points

step-by-step explanation:

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