Urgent can someone pls tell me the answer so i know if i'm correct- scientific notation 3.7 x 10^-5 x 2.0 x 10^8

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Solutions for 2x+7 less than or equal to 3x-5