If the equation of a line is written in the

form,

is the y-intercept.

The y-intercept is -1. The line crosses the y-axis at the point (0,-1).
-10p+9=12
-9 -9
-10p=3
—— —
-10 -10
P=3/-10 or -0.3
You could understand the ration as parts: the total number of parts was 3+7=10.
So girls were 3/10 parts and boys 7/10 parts. The difference was 7-3=4 parts. this difference is equal to 360, so each part is 90 (4*90 =360).
so girls are "3 parts" and each part is 90, then the number of girls is 3*90=270.
Answer:
Just under 62 inches.
Step by Step:
4.9×2×Pi= 30.7876080052. x2= 61.5752160104