Someone please help me determine if the following sets are closed under the given operation/ help me by showing work as well justify answer? M=[all numbers of the form 2^n, for natural numbers] under addition?

N=[all numbers of the form 2^n, for n natural number] under multiplication?​

Will’s boss has asked him to compile the credit scores of everyone in his department. the data that will collected is shown in the table below. what is the mode of the credit scores in will’s department? (round to the nearest whole point, if applicable.) 634 667 644 892 627 821 857 703 654 a. 667 b. 722 c. 627 d. there is no mode in this group.