Hey there!

Firstly, we are going
add 
on each of the sides that we're working with. like ↓

This gives us

(if you are wondering how we got the out come of

it is because I
added 
Now
multiply 
on each of your sides
Cancel the first set and you will find the value of

Good luck on your assignment and enjoy your day ~
Step-by-step explanation:
Use the sine and cosine trig functions
21) cos(52)=13/x
x=13/cos(52)
x=21.1
22) sin(75)=6/x
x=6/sin(75)
x=6.2
If you look at the position they all go up one and the value of terms all go up by 3 so 4+1=5 so 5 goes where no is and and 11+3=14
24/26 or opposite over adjacent. The answer is C