How many Eights go into 2

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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 are the domain and range of the function f(x)=2^x+1