Which summation properties or formulas must be used to evaluate this summation? Check all that apply 35
E n(n^2+1)
n=1

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

hm let me think hm think think hm think yes

the answer is d

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