Area of this question?

In the figure dhg fhe which statement is true by cpctc

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Which three lengths could be the lengths of the sides of a triangle? 21 cm, 7 cm, 7 cm 9 cm, 15 cm, 22 cm 13 cm, 5 cm, 18 cm 8 cm, 23 cm, 11 cm