What is the length, in units, of the line segment with endpoints at (1, 4) and (3, 7)? A. √137

B. √15

C. √5

D. √13

Can someone me with these two circle theorem questions asap?

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?