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NOTE: please make it readable and clear. Review Directions: Follow the instructions in Part A and Part B to complete the assignment. Part ADirections: 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. Part B Directions: Now, find n and Sn for each of the following arithmetic series below. 11. 5 + 11 + 17 + 23 + ...+ 101 12. 2 + 4 + 6 + 8+ ...+ 60 13. 46 + 43 + 40 + ...+ 16