Which of the following equations have x=2,y=1 as a solution
a)2x+5y=19
b)2x+3y=14
c)5x+3y=14
d)2x+3y=7

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 =

Acone with radius 5 cm and height 12 cm how many cm ?

If f(x)=x^2- 4 and g(x)=x^2 plus 2 x, (c) (f-/3) = ? (simplify your answer.)