Total pay after deductions is know as?

The highest common factor of 132 and 220

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

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?