What must be true about angle 6 and angle 3 for the lines to be parallel? name the postulate or therom

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

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?

Solve: 3x+y=6 4x-2y=18 show all work !