Why is the product of two negatives always positive

Adriano loves anime and collects toys from his favorite series.each month he gains 4 toys. if adriano has 3 toys when he starts collecting, how many does he have after 4 months

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Asystem of linear equations contains two equations with the same slope. select all of the correct statements. i a. the system may have two solutions. - b. the system may have infinitely many solutions. c. the system may have one solution. o d. the system may have no solution. submit