Which function has two x-intercepts, one at (0,0) and one at (4,0)? f(x) = x(x - 4) f(x) = x(x + 4) f(x) = (x - 4)(x - 4) f(x) = (x + 4)(x + 4)

Volume of cylinder with a radius of 8cm and height of 25 cm

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4