Please help me I am taking a quiz and have 7 minutes left

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

If 20% of a number is 35, what is 50% of that number?

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