If f(x)=5x+40,what is f(x) when x=-5?

Ihave trouble finding the nth term of a linear sequence

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

What is the value of x in the equation7x+2y=48 when y=3