Ive done one but i cant seem to get the rest right please help

Answer and Step-by-step explanation:

All you have to do is plug 6 in for x.

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A) 6 + 4 = 10      The 6 and 4 add together to make 10.

B) 3(6) = 18        The 3 and 6 multiply together to make 18.

C) = 3              The 6 is divided by the 2 to make 3.

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The sum of n terms for the arithmetic series is:

The value of n for which the series has sum 165 is 11

The given series is:

5 + 7 + 9 +.......

The first value, a = 5

The common difference, d = 7 - 5

d  =  2

The sum of the first n terms of an arithmetic series is given by the formula:

Substituting a = 5, and d = 2 into the sum of the series, we have:

To determine the value of n for which the series has sum 165, substitute into the sum above

The value of n for which the series has sum 165 is 11

Learn more on Arithmetic Progression here: link