Let event a= the place is a city let event b= the place in north america what is p(a or b)

What should be done to both sides of the equation in order to solve -5m = -40? a) multiply by -5. b) divide by -5. c) multiply by -40. d) divide by -40.

Im so bad at fractions they are not my best math thing to work on

For the following equations, find the ratio of a to b. be sure to show all of your work. a. 3a = 6b b. 15a = 5b