Mary's age is 5 times jose's age. the sum of their ages is 18. how old is each?

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

F(x) = x2 − 9, and g(x) = x − 3 f(x) = x2 − 4x + 3, and g(x) = x − 3 f(x) = x2 + 4x − 5, and g(x) = x − 1 f(x) = x2 − 16, and g(x) = x − 4 h(x) = x + 5 arrowright h(x) = x + 3 arrowright h(x) = x + 4 arrowright h(x) = x − 1 arrowright

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?