Answer:
10
Step-by-step explanation:
We know that area is 50km^2 and to find area we know the formula it is Area = base * height, 50 = b*5, so b must be 10
x = 7 ± √73 / 2
2
h(4)=-1
g(h(4))=g(-1)=3
f(3)=2
