Sorry the pictures bad but can anyone help?

Apple pie is removed from 350 degree oven. temperature of the pie t minutes after being removed id given by the function t(t)=72+268e-0.068t

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

Rewrite the following quadratic functions in intercept or factored form. show your work. f(t) = 20t^2 + 14t - 12