12. if -3, -3x, -5x is a geometric sequence, what is x?
A. 5 B. 6 C. 7 D. 8
13. The first term of an arithmetic sequence is equal to 250 and the common difference is -5. Find the 15th term?
A. 120 B. 130 C. 150 D.180
14. Find the common ratio of the sequence 6, -18, 54, -162, ...?
A. -3 B. 3 C. 6 D. -6
A. 5 B. 6 C. 7 D. 8
13. The first term of an arithmetic sequence is equal to 250 and the common difference is -5. Find the 15th term?
A. 120 B. 130 C. 150 D.180
14. Find the common ratio of the sequence 6, -18, 54, -162, ...?
A. -3 B. 3 C. 6 D. -6
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Answer:
12. Wala po
13. D
EXPLANATION/SOLUTION
An = A1 + d(n-1)
An = 250 + (-5)(15-1)
An = 250 + (-5×14)
An = 250 + (-70)
An = 180
14. A
EXPLANATION
(-18) ÷ 6 = (-3)
54 ÷ (-18) = (-3)
(-162) ÷ 54 = (-3)