1 22
12. The sum of the first n terms of series is 3n+ n. Find the nth term of the series and show
that the series is an arithmetic progression. State the value of the first term and the common
difference.
13. In a geometrical progression, the sum of the first two terms is 3, and the sum of the second
and third terms is -6. Find the first term and the common ratio.
14. How many terms of the series 2 - 6 + 18 – 54 + ... are needed to make a total of 1 (1-38)?​

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2xdesmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x