Find GH 4.6 J H 3.6 K 3.6 G

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

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

Having a hard time understanding this question (see attachment).