Perform the following operations when f(x)= x^2+5x and g(x)=4x-7 9. f(x)+g(x)
10. f(x)-g(x)
11. f(x)•g(x)
12. g(x)-f(x)

How do you find the area of a triangle

Somone me i want to know what 18 hours out of 24 hours in a fraction

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 =