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What is the measure of x, in degrees

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

Barrett is comparing the membership fees for two museums.the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?