5x+-7(x-2) help me ty

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42