Maths -surds pls with working out : )

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?

Triangle xyz has vertices x(1,3), y(0,0)

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28