Question

Which of the following is the correct expanded form for the series below?

Answer 1

Answer:

The correct option is A) $(7+3\cdot 1)+(7+3\cdot 2)+(7+3\cdot 3)+(7+3\cdot 4)$.

Step-by-step explanation:

Consider the provided series.

$\sum_{n=1}^{4}(3n+7)$

Substitute the value of n = 1,2,3 and 4 respectively.

$(3\cdot 1+7)+(3\cdot 2+7)+(3\cdot 3+7)+(3\cdot 4+7)$

Which can be written as:

$(7+3\cdot 1)+(7+3\cdot 2)+(7+3\cdot 3)+(7+3\cdot 4)$

Therefore, the correct option is A) $(7+3\cdot 1)+(7+3\cdot 2)+(7+3\cdot 3)+(7+3\cdot 4)$.

Answer 2

Answer:

A.

Step-by-step explanation:

four terms are needed. 1-4

so that eliminates bottom 2 choices