.If31z5isamultipleof9,wherezisadigit,
Whatisthevalueofz?
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Answer:
0/9
Step-by-step explanation:
Divisibility rule of 9- sum of digits of the number must equal to 9. 3+1+5=9
9+0, 9+9, both equal to a multiple of 9. Plus, z can only be a digit
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