I need help I don't understand

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)