Given the arithmetic series a1+a2+a3+a4 12 + 19 + 26 + 33 + . . + 110 what is the value of sum?

Two adjacent terms of an arithmetic sequence differ by a fixed amount - the common difference.

In this case, the terms differ by 7. So, we can write your sequence as

So, first of all, we can observe that the last term is

So, we're summing the first 15 terms of the sequence:

We can work out the sums as follows: it is trivial that

As for the other sum, we have

So, the value is

$3720

step-by-step explanation:

taxable income = $31000

as per the 2018-2019 us tax bracket, the tax rate is 12% for an individual whose taxable income is between $9,526 to $38,700.

so, the tax to be paid by him = 12% of 31000

= 0.12 * 31000     [12% converted to decimal as 0.12]

= $3720