A restaurant had a total of 15 tables-some long rectangular tables and some round ones. Long tables can seat 6 people . Round tables can seat 3 people. On a busy evening, all 75 seats at the tables are occupied . How many round tables and long tables are there at the restaurant ?

The vertices of a rectangle are given in the columns of the matrix . if is found to perform a transformation, what are the coordinates of the transformed rectangle? (0, 0), (0, –3), (–3, –3), (–3, 0) (0, 0), (0, 3), (3, 3), (3, 0) (0, 0), (0, 3), (–3, –3), (–3, 0) (0, 0), (0, 3), (–3, 3), (–3, 0)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)