Answer:
64.8
Explanation:
first you draw out the problem and label the sides of the triangle. since you are finding an angle you use the -1. so looking at the triangle you know that it will be Tan^-1 (Opposite/adjacent). so you write the problem
tan^-1(850/400)= 64.79887635
rounded to the nearest tenth would equal
64.8.
so your answer is 64.8.
Hope this helps! :)