i am stuck on this one sorry
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I'll use these symbols for each coin: P = Penny; D = Dime; N = Nickel 12 P 7 P & 1 N (7 + 5) 2 P & 2 N (2 + 10) 1 D & 2 P (10 + 2)
for a integer n, we call d the divisor of n if d divides n without leaving a remainder. So, for example, 49/7=7 and 7 is a divisor or a factor of 49. ( n=49, d=7 in this case) Since 7 is the divisor the reciprocal of 7 is just 1/7. In general is n is a divisor, 1/n is the reciprocal.
This depends on your definition. One could say that circles ({p in R^n : d(p,m) = r}) are concave, while (open) disks ({p in R^n : d(p,m) < r}) are convex.
1 q 1 d 1 q 2 n 2 d 3 n 3 d 1 n 1 d 5 n 7 n