The variable z is directly proportional to x and inversely proportional to y. when x is 12 and y is 18 z has the value 2 what is the value of z when x = 19 and y = 22

The empire state building in new york city is 1454 feet tall a model of a building is 24 inches tall what is the ratio of the height of the model to the height of the actual empire state building

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?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?