It's A 15.6
I know it's late but i hope i helped :D
A = 21/2 i will write something too just to fill up the space
<span>you have to take arctan(0) to find the value of theta.
tan^-1 (x)=theta </span>
Answer:
6r+7=13+7r
6r+7=7r+13
6r+7−7r=7r+13−7r
−r+7=13
−r+7−7=13−7
−r=6
= 
r=−6
Step-by-step explanation:
:) This is the answer