What is the value of the variable z and the measure of Angle B?

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts. write an equation for sadie’s way of calculating the

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?