How do you solve he formulas for numbers 9 and 10?

9)

t = V+K/g, n=multiply both side by g to get :

TG = V+K

 now divide both sides by T to get G alone

 so G = V/t + K/t = g = (V+K)/t

10)l = -a +2S/2

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

i think u have 12 apples sorry again i don't really know if it correct i'm just tryna hrlp people out.