Perform the operation. 3/a^2b + 2/ab^2

Given tan∅=4/3 and π< ∅< (3π)/2; find cos2∅ a. -24/25 b. 24/25 c. -24/7 d. -7/25

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?