For the following right triangle, find the side length x. round to nearest hundredth

Well we can use the pythagorean theorem

So they give us C=17 and A =12

12^2+b^2=17^2
Simplify and we get 12.04

For any right triangle with legs length a and b and hypootonuse length c (hypootnuse is longest side aka one oposite right angle)
a²+b²=c²

so
we have c=hypotonuse=17
a leg=a=12
other one=b=x

so
12²+x=17²
144+x²=289
minus 144 both sides
x²=145
sqrt both sides
x=√145 or about 12.04

The answer would be 366%