Answer:
1. 12/5, 12 to 5, 12:5
2. ?
3.?
4. GCF = 2 LCM = 10
5. ?
6. rate = 42/6 unit rate= $7 per book
7. ?
8. 12/48 = 25/100
9. 36 days
10. y = x * 2, y = x -3
11. 3 · (4^2 - 5) · 2, (3^3 + 3) · 4 ÷ 3
12. Solve = 4 I dont know how to model it
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