Read and analyze each item carefully. Write the letter of the correct answer in a separate paper. Show your solution. (2 points each)

1. Find the sum of the first 12 terms of the arithmetic sequence 4, 11, 18, 25, 32, …
A) 610 B) 530 C) 510 D) 410

2. The sum of the first 12 terms of an arithmetic sequence is 606. What is the first term if the last term is 67?
A) 64 B) 54 C) 34 D) 44
3. The second term of an arithmetic sequence is −16 and the eighth term is 8. What is the sum of the first 10 terms?
A) −15 B) −20 C) 15 D) 20

4. Find the sum of the first 40 terms of the arithmetic sequence if the first term is 16 and the tenth term is 70.
A) 5320 B) 1720 C) 2200 D) 6320

5. Find the sum of the first 15th terms of the arithmetic sequence whose nth term is an = 5 + 3n.
A) 870 B) 860 C) 435 D) 430

6. The first term of an arithmetic sequence is 8, the last term is 56 and the sum is 416. Find the number of terms.
A) 13 B) 12 C) 11 D) 10

7. If the first n terms of the arithmetic sequence 24, 20, 16,... are added, how many of these terms will be added to get a sum of −60?
A) 35 B) 30 C) 25 D) 15

8. Mary gets a starting monthly salary of Php 8,000 and an increase of Php 800 annually. How much income did she receive for the first four years?
A) Php 441,600 B) Php 388,800 C) Php 40,000 D) Php 36,800

9. Mirasol saved 8 pesos on the first day of January, 11 pesos on the second day, 14 pesos on the third day, and so on, up to the last day of the month. How much did Mirasol save at the end of January?
A) Php 4282 B) Php 4290 C) Php 1643 D) Php 1 590

10. Mrs. De la Cruz started her business with an income of Php 250,000 for the first year and an increase of Php 6,000 yearly. How much is the total income of Mrs. De la Cruz for 6 years since she started her business?
A) Php 530,000 C) Php 1,590,000 B) Php 3,180,000 D) Php 1,608,000