Avariable whose value is less than zero is called

Restrictions on f(x) = 1/x+5 and g(x) = x-2

Solve the system of equations. y= 2x y= x^2 - 15

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?