Gina read 20 pages in 4 days. which reading rate is equivalent?

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

Ineed me i stuck and i don’t want to get it wrong

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?