Projectile motion

[matt123]

Hi all just a little help/clarification required. I am measuring how the launch angle affects the accuracy of the projectile. In the image that I have attached it demonstrates that for angles up to 45 accuracy decreases and will increase again from 45 to 75 degrees above the horizontal.  However for the next part I used the equation below to calculate the range for accounting for air resistance. Those results are attached below. However this is not in conjunction with my other results. In the second part from the data I got that as time of flight increases the accuracy decreases when accounting for air resistance. However this is different to the first screenshot. Can I get some help please.