13. Come on this one is easy. HAHAHA :P
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42/8= 5 R2, so it is 5 and 2/8. 2/8 can be simplified to 1/4 therefore 5 and 1/45 1/4 or 5 2/8
15 hours : 5 days = 15 hours : 5*24 = 120 hours = 1 hour : 8 hours = 1 : 8 Answer: 1:8
(4 - 8) / (9 - 5) = -1 or -1/1
0.635 is 625/1000. In lowest term, it is 5/8. 1/8 is 0.125, so 5 more 1/8s is 5/8 or 0.625.
2.3 recurring