12. A. 7
So the common difference is 7.
13. D.
14. A.
{sum of geometric sequence}
15. C. 15
120 ÷ 2 = 60
60 ÷ 2 = 30
30 ÷ 2 = 15
So the third of these geometric means is 15
{properties of geometric sequences}
16. C. 125
1, 0.2, 0.24,0.008... is the formula of summation for geometric sequence.
17. C.
18. C.
∴ geometric sequence
∴ Choose C.
19. A. ‐2
20. C.
Solution:
{Examine the knowledge of multiplication}
From the given question, we can calculate as follows:
16 first hour
Therefore choose C.
21. B. 2 048 000
Copyright © 2024 EHUB.TIPS team's - All rights reserved.
Answers & Comments
ANSWER:
12. A. 7
Solution:
So the common difference is 7.
13. D.
14. A.
Solution:
{sum of geometric sequence}
15. C. 15
Solution:
120 ÷ 2 = 60
60 ÷ 2 = 30
30 ÷ 2 = 15
So the third of these geometric means is 15
{properties of geometric sequences}
16. C. 125
Solution:
1, 0.2, 0.24,0.008... is the formula of summation for geometric sequence.
17. C.
18. C.
Solution:
∴ geometric sequence
∴ Choose C.
19. A. ‐2
20. C.
Solution:
{Examine the knowledge of multiplication}
From the given question, we can calculate as follows:
16 first hour
Therefore choose C.
21. B. 2 048 000
#CarryOnLearning