James's T-shirt business uses the demand function P=-Q+ 31 and the supply function P= Q- 17. According to these functions, what will the
equilibrium point (P, Q) be for James's T-shirt business?
A. (24,7)
B. (17, 31)
C. (31,73)
D. (7.24)

I'm confused on this could anyone me and show me what i need to do to solve it.

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.