Which one's are proportional, which one's are not? 1. 3/7 = 6/8

2. 2/5 = 10/24

3. 9/21 = 3/7

4. 10/12 = 2/8

5. 25/15 = 5/3

6. 12/4 =9/3

7. 11/12 = 8/13

8. 21/ 7 = 6/2

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Pls brainliest will be awarded if answer is correct