Why do you first combine like terms and then use the distributive property to solve 8(5x+9x+6)=160

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Which of the following exponential functions goes through the points (1, 6) and (2, 12)? f(x) = 3(2)x f(x) = 2(3)x f(x) = 3(2)−x f(x) = 2(3)−x

Find the unit rate. enter your answer as a mixed number. a fertilizer covers 2/3 square foot in 1/2 hour.