I need help with several questions, I don't really understand pre algbrea at all.

SOLUTION:
Step 1:
In this question, we are given the following:
Step 2:
Using the data in the table to find the rate of change in the length of the baby girl:
Choosing any two consecutive points, we have that the:
[tex]\text{Average Rate of change =}\frac{Differen\text{ce in the two consecutive lengths }}{\text{Difference in the consecutive months}}[/tex][tex]Average\text{ Rate of change = }\frac{21.5\text{ -20}}{6-4}[/tex][tex]\begin{gathered} \text{Average Rate of change =}\frac{1.5}{2} \\ =\text{ 0.75 inch per month} \end{gathered}[/tex]CONCLUSION:
The final answer = 0. 75 inch per month