Give a triangle with b=3 c=9 and a=21degrees

Right Triangle

Step-by-step explanation:

Right Triangles are attributed with the Pythagorean theorem,  a^2+b^2=c^2. In this case (3*3)+(9+9)=(21*21) is right so this is a right triangle.

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2