How do i solve 4(5(6))

this is a hypothetical question

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

What value of x is in the solution set of 4x – 12 s 16 + 8x?

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