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I was suppose to calculate the minimum and maximum angles.

I got 24.3 and 70.8.

I set up this equation:

xf=xi+vi*cos(theta)t

yf=yi+vi*sin(theta)t+4.9t^2

if you solve x time, and then sub it in, it comes out to

yf=yi+tan(theta)x+(4.9x^2/v^2)tan^2(theta)

3.75=0+tan(theta)42.2+(4.9(42.2)^2/26.2^2)tan^2(theta)

I'm not sure where I'm making the error.

I think I did this right, we were told to use the quadratic formula and treat the tan as variables. I'm not really sure what I did after that however.