PLZ HELP ITS TIMED

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

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2