Which of the following ordered pairs represent the unit rate

Two line segments are shown in the figure below. suppose that the length of the line along the x-axis is 6, and the length of the hypotenuse of the triangle is 10. what is the equation of the hypotenuse line (shown in red, below)?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?