Maths problem URGENT!

I don't suggest you taking the significant figures in your working step.ALL the estimation should be taken place after you get the answer
1. h/tan40°=100-h/tan30°
h/tan40°+ h/tan30° =100
h(1/tan40°+ 1/tan30°) =100
h=100/(1/tan40°+ 1/tan30°)
h=34.2(correct to 3 sig,fig,)

2.AD/tan70°=AD/tan25°-80
AD/tan25° -AD/tan70° =80
AD(1/tan25° -1/tan70°) =80
AD=80/ (1/tan25° - 1/tan70°)
AD=44.9(correct to 3 sig,fig,)

1. h(1/tan40 + 1/tan30) = 100
h(1.192 + 1.732) = 100
h = 34.2

2. AD(1/tan70 - 1/tan25) = -80
AD(.364 - 2.145) = -80
AD = 44.92