Which is not a solution for 4x-9 less than 3

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?

Can someone me do math because i am having a breakdown rn because i don’t get it

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?