Write a formula for the nth term of the arithmetic sequence 1, 5, 9, 13, ……. then use the formula to find f(20).

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 you me find the missing length. i attached an image.

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?