Suppose three people ate a meal in a restaurant. the cost of each of their meals is m. one person intends to tip 10%, the second person intends to tip 15%, and the third person intends to tip 20%. which expression represents the total amount that they'll pay?

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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

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.