HALP MY FRIEND NEEDS HELP AND ITS DUE TM (ALSO 69 POINTS ;) PLS ANSWER QUICKLY For the positive integer n, let [n] denote the sum of all the positive divisors of n with the exception of n itself. For example, [4]=1+2=3 and [12]=1+2+3+4+6=16. What is [[[28]]]?

40

Step-by-step explanation:

If just take

It is related to Mersenne prime, because 28 is a perfect number.

u rich

step-by-step explanation:

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".