When you do area of a triangle does it matter which number you split up///b x h x 1/2

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?

With alll of except for the 2 that i did already

Find solution of the linear equation y = 2/3x + 1/3