PLEASE HELP ME ASAP IM ON A TIME LIMIT TESTWhich expression could be modeled using a diagram?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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?

Identify the number as a rational or irrational.explain. 127