Jan's age is 3 years less than twice tritt's age. the sum of their ages is 30. find their ages.

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

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.