Answer:
64.94
Explanation
You arrange the numbers in such a way, to be in line with their decimal points like this:
70.7
-5.76
Then you subtract. Notice that on top of the 6 is nothing which is equal to 0
If M is a midpoint of PQ, then we can use the formula of a midpoint:

We have the endpoints (-2a, 0) and (0, 2b). Substitute:

<h3>Answer: M(-a, b)</h3>
I am assuming x is the same thing as b.
−7.5(x−3)=3.75
-7.5x+22.5=3.75
-7.5x=-18.75
x=2.5
The Y-Axis is higher on the "+4" equation, so the parabola will look taller.