r = 39/13 = 3
check
117 /39 = 3
true
so r=3
Answer:
1. 245=5x7x7
=7² x5
2. 250=5x5x10
=5²x10
3. 225=9x5x5
=5²x9
B) 6(x+2y) + 4 = 6x + 12 y + 4
15-3=12
12/3=4
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