Get this right for Brainliest. -ヽ(≧∀≦)ﾉ

 y=4,728,779,608,739,020,800

Step-by-step explanation:

based on the values you have for m & b it would be...

y=4,200 x

y=4,200 x 1,125,899,906,842,624

y=4,728,779,608,739,020,800

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!