Can anyone please figure this out for me( you don’t have to do x-intercept!)

Which formula gives the area of a triangle? a=1/2(b+h)

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

The two cylinders are similar. if the ratio of their surface areas is 9/1.44 find the volume of each cylinder. round your answer to the nearest hundredth. a. small cylinder: 152.00 m3 large cylinder: 950.02 m3 b. small cylinder: 972.14 m3 large cylinder: 12,924.24 m3 c. small cylinder: 851.22 m3 large cylinder: 13,300.25 m3 d. small cylinder: 682.95 m3 large cylinder: 13,539.68 m3