Do all of them step by step and number by number

8. Let the original length be x. The print is 8 times larger, so the print length is 8x. The print length is 72 inches, so the equation is 8x = 72.

8x = 72

x = 72/8

x = 8

8 inches

9. Each of the 5 friends will pay the same. Let x = the amount each person pays. There are 5 friends, so the 5 friends pay a total of 5x. The total paid is the cost of the TV plus the tax. We set 5x equal to the total cost to get the equation. 5x = 210 + 15

5x = 210 + 15

5x = 225

x = 225/5

x = 45

$45

10. I choose to work backward.

Each person had 3 servings. There were 6 people. The number of servings made is the number of servings each person had (3) multiplied by the number of people (6). 3 * 6 = 18, so there were 18 servings made.

18 servings

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!