In a batch of 140 water purifiers, 28 were found to be defective. What is the probability that a water purifier chosen at random will be defective?

Two numbers have a sum of -19. one number is x. what expression represents the other number?

Simplify the rational expression. state any restrictions on the variable. t^2-4t-12 / t-8 the / is a fraction sign.

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9