Directions: Find the sum for each of the following arithmetic series below. Use the summation formula to find the sums. 1. A series with six terms, the first term is five, and the common difference is five.

2. A series with six terms, the first term is nine and the common difference is twelve.

3. A series with five terms, the first term is 5.7 and the common difference is 1.4.

4. Find the sum of the first 21 terms in a series where a = 20 and t21= 400.

5. Find the sum of the first 100 terms in a series where a = 0 and t100= 99.

6. Find the sum of the first 50 terms in a series where a = 4 and t50= 196.

7. Find the sum of the first 100 terms in a series where a = 0 and t100= 99.

8. Find the sum of the first 10 terms in an arithmetic series where t7= 7 and t10= 13.

9. Find the sum of the first 10 terms in an arithmetic series where t5= 15 and t10= 45.

10. Find the sum of the first 30 positive multiples of 5.