Simplify square root of negative 48

Cody worked 42.5 hours per week in july. this is 12.25 hours more per week than he worked in june.how many hours did cody work per week in june?

What is the y-intercept of the line given by the equation

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.