40 points someone me with these 3 math questions got a deadline to meet

give right answers no false

5. evaluate the function f(x) = 4 ∙ 7^x for x = -1 and x = 2. show your work

17. find the roots of the quadratic equation x^2 - 8x = 9 by completing the square. show your work

18. use the discriminant to find the number of real solutions of the equation 3x^2 - 5x + 4 = 0 show your work.

a water balloon is tossed into the air with an upward velocity of 25ft/s. its height h(t) in ft after t seconds is given by the function h(t) = - 16t^2 + 25t + 3. show your work

19. after how many seconds will the balloon hit the ground? (hint: use the quadratic formula)

20 what will the height be at t = 1 second