Can yall me with this question asap

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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 =

Determine which postulate or theorem can be used to prove that lmn =nmo