Answer each question about the following arithmetic series: 12 + 18 + 24 + 30 + . . . + 198

What is the value of the arithmetic series?

630

1,260

3,360

6,336

(c) 3360

Step-by-step explanation:

Given

The above arithmetic series where:

--- first term

--- the common difference (18 - 12 = 6)

--- The last term

Required

The value of the series

First, we calculate n using:

This gives:

Collect like terms

Divide both sides by 6

Make n the subject

The sum of the series is:

So, we have:

the anwser is d) 75°

step-by-step explanation:

d

step-by-step explanation:

i used the pitagoras theoreme