Answer:
<h3>C. (a, b)</h3>
Step-by-step explanation:
The formula of a midpoint:

We have A(0, 0) and C(2a, 2b). Substitute:

M(a, b)
Answer:

Step-by-step explanation:
Given expression:

Expand following:

Distribute inside parenthesis:

Multiply/Simplify following:

Answer:
90
Step-by-step explanation:
a)
Since, to find the average of a set of numbers, you need to add them all together and divide by the amount of numbers:

b)
Multiply both sides by 4:

Hope this helps!
Answer:
C
Step-by-step explanation: