What are the two classifications of real numbers

Is the square root of 4 plus the square root of 16 rational?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?