10. Show that if 2 m + 1 is an odd prime, then m = 2 n for some nonnegative integer n.[ Hint: First show that the polynomial identity x m + 1 = (x k + 1)(x k(t−1) − x k(t−2) +···−x k + 1) holds, where m = kt and t is odd.]

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation:

27 +27 or 27times 2=54

the diffrence is 0