Answer:
x = 18.0
Step-by-step explanation:
You must memorize the definitions of the trig functions and then these types of problems are easy.
In your problem, sin of an angle = opposite side/hypotenuse
So, sin 51 = 14/x
x sin 51 = 14
x = 14/sin 51 = 18.0
Ok, so after you do -8a+5a, you also have to do 6 -35, getting the equation
-29-3a
3.1 divide by 10.261
=3.1