In need of Physics lab help!

Hey guys, i need help in deriving the fraction error equation using these formulas.

In this experiment, the acceleration due to gravity is related to the time t it takes the ball to fall a distance y by Eq (3) g=2g/t^2. With this equation and Eq. (2) deltaw/w = squareroot=(ndeltaa/a)^2+(mdeltab/b)^2+(… show that the fraction error deltag/g = deltag/g=squareroot(deltay/y)^2+(2deltat…

Thanks!

I believe the equation is : deltag/g = deltag/g=squareroot(deltay/y)^2+(2deltat…
But sorry I don't know how to solve it elb.