Help asap plzz will give brainliest and 40pts

Evaluate the expression for the given value of the variable 7a - 4a for a =8

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²