Answer: 12 inches to 1 foot.
Step-by-step explanation: Well, there is 12 inches in 1 foot, so the last one if I'm not mistaken. knowing this, 100 / 12 = 8.33
100 inches per minute converts to 8.33 feet per minute.
28 + 500 = 528, so just make 4 expressions with the answer of 528 for each
1. 21 + 507
2. 1 + 527
3. (4 x 7) + 500
4. 530 - 2
There are a whole lot more ways, so you can change these if you want. (It's really super simple.) Hope this helped