Which relation is a function?

a. {(-2,10), (-6,10), (-2,3)}

b. {(5,5), (5,9), (5,15)}

c. {(0,3), (0,9), (12,-4)}

d. {(-5,1), (4,9), (6,10)}

Derricks dog sitting and darlene's dog sitting are competing for new business. the companies ran the ads shown.which dog sitting service is more economic to use if you need 5 hours of service? explain.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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.