The explicit formula for calculating the sum is

The sum of the nth term of a sequence is expressed as;

a is the first term
d is the common difference
n is the number of terms
For the sequence 0 + 1 + 2 + 3 +...

Similarly for the sequence:
1 + 2+ 3 + 4+...

Taking the product of the sum to get the explicit formula for calculating the sum

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Answer:
Step-by-step explanation:
4x-8y
Perentheses, probably do multiplication.
Answer:
Step-by-step explanation:
becasue you can square a negative number