1. What is the sum of the first 19 terms of the arithmetic series?

3+8+13+18+…

2. What is equal to?

3. What is the sum of the first 75 even numbers starting with 2?

3 + 8 + 13 + 18

The 19th term is given by

3 + 5(19-1) = 3 + 5(18) = 93

And the sum is given by

[ 93 + 3] (19/2) =

96/2 * 19 =

48 * 19 =

912

The second isn't showing up for me

For the third, we have

(n) (n + 1) where n = 75

75 * 76 =

5700