Someone please help me

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Which of the following shows the length of the third side, in inches, of the triangle below

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?