What is the solution set of the following system of equations?

5x - 3y - 10 = 0
x + y - 7 = 0

a.{(31/8, 25/8)}
b.{(25/8, 31/8)}
c.{(45/2, 31/2)}
d.{(31/2, 45/2)}

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

How do you find the circumfrance of a circle?

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer