20:16 docs.google.com FOREST TRAIL ACADEMY | WWW.FORESTTRAILACADEMY.COM PRECALCULUS | SEQUENCES & SERIES| ARITHMETIC SEQUENCES 9. Given a, = 33 and a, = -15, find the fourth term of the arithmetic sequence. 10. Given a, = 21 and a15 = 42, find the first term of the arithmetic sequence. Write a recursive formula for each arithmetic sequence and then find the specified term. 11. a = {7, 4, 1, ...}; find the 21* term 12. a = {2, 6, 10, ...}; find the 12th term Find the number of terms in the given finite arithmetic sequence. 13. a = {1.2, 1.4, 1.6, ..., 3.8} 14. a = {6, 11, 16, ..., 56} 15. Find the 8th term of the arithmetic sequence {9b, 5b, b, ...}. FOREST TRAIL ACADEMY | WWW.FORESTTRAILACADEMY.COM PRECALCULUS | SEQUENCES & SERIES| ARITHMETIC SEQUENCES20:16 AA docs.google.com PRECALC_ArithmeticSequences.docx PRECALCULUS | SEQUENCES & SERIES| ARITHMETIC SEQUENCES Write the first five terms of each arithmetic sequence. 1. a, = -15, d = 1.25 2. a, = 0, d = -4 3. a, = 17, a7 = -31 4. a12 = - 50, a22 = -150 5. a, = -10; an = am1 + 5 6. a, = 4; an = 2am Given the first term and common difference, write the explicit formula for the arithmetic sequence and then find the specified term. 7. a, = 3, d = 4....find the 10" term 8. a, = 5, d = 6....find the 8" term FOREST TRAIL ACADEMY | WWW.FORESTTRAILACADEMY.COM PRECALCULUS | SEQUENCES & SERIES| ARITHMETIC SEQUENCES 9. Given a, = 33 and a, = -15, find the fourth term of the arithmetic sequence. 10. Given a = 21 and as = 42. find the first term of the arithmetic sequence