the first term of an arithmetic sequence is 17 and the 60th term is 194 and the 65 term is 209. the sum of the first 60 terms is 6330. What is the sum of the 20th and 30th terms?

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The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase