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Find the sum of the summation of 3 i plus 2, from i equals 5 to 13

Question

anonymous · Answer

im confused

anonymous · Answer

answer choices
261
41
220
38

kropot72 · Answer

This question can be treated a an arithmetic series, with the first term being 15 + 2, the last term being 39 + 2, and the number of terms being 13 - 5 = 9.
The required formula is
$$\large S=\frac{n}{2}(a+L)$$
where S is the sum of n terms, a is the first term and L is the last term.

anonymous · Answer

the first term is 13 and last term is 5 and the sum of terms 3i+2

kropot72 · Answer

No. 
The first term is found by plugging in the value i = 5 into 3i + 2, giving:
First term = (3 * 5) + 2 = 17
The last term is found by plugging in the value i = 13 into 3i + 2, giving:
Last term = (3 * 13) + 2 = 41
Do you understand?

anonymous · Answer

yes can u answer another question

anonymous · Answer

What is the rate of change between the interval of x = pi over 4 and x = pi over two

kropot72 · Answer

Good. Please post your other question as a new question, the reason being that I must log out now.

anonymous · Answer

ok