The sum of 9 and a number is twice a number plus 14. How would I write this as an equation?

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

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

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?