Nine months ago Alexa deposited $7,000 in a three-year CD. She has received $224.16 in interest.

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

Don't know how to find x given these segment lengths

The suare root of 9x plus 7 plus the square rot of 2x equall to 7