For a geometric sequence that has r=-4/5 and U₆ = -1280, find the 20th term. -56.3
109.9
-88
70.4

Given than two terms of an arithmetic sequence are U₅ =-3.7 and U₁₅=-52.3 , find the value of the 19th term *
-71.74
-664
52
Other

For the following infinite series, find the indicated sum 1/5 + 8/15 +13/15 + ... S₇ *
42/5
-42/5
-3/15
42/15
Other