I am so confused please help

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?