Can a moderator me with this math?

brian, zack, dan, jay, ed, and andrew want to play a two-player video game. if only two people can pay at a time, how many different pairs can they form for the first matchup?
a 12
b 36
c 15
d 30

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

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

Factor the trinomial below. 12x^2 - 32x - 12 a. 4(3x+3)(x-1) b. 4(3x+1)(x-3) c. 4(3x+6)(x-2) d. 4(3x+2)(x-6)