PLEASE HELP IM IN A GROUP WITH SMART KIDS AND ITS GETTING ME ANNOYED BC I DONT KNOW THE ANSWER

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

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse