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Mathematics 61 Online
OpenStudy (awkwardpanda):

Check my answers please? 1. What are the first five terms of the sequence given by the formula a_n=6n+1 a. 7,13,19,25,31 b.1,7,13,19,25 c. 6,12,18,24,30 <--- d.13,19,25,31,37 3. Write an explicit definition for the sequence -3, 1, 5, 9,... a. a_n=-3+4(n-1) b. a_n=-3+ 4n <--- c. a_n= -3+(n-1) d. a_n= -3+4(n+1) 7. what is the 12th term of the sequence 20,16,12,... a. -30 b. -20 c. -28 d. -24 <---- 8. Find the missing term of the arithmetic sequence 20, __, 32,... a.42 b.18 c.34 <---- d. 36 10. what is the 10th term of the sequences 625,125,25,... a. 1/3,125 b. 1/

OpenStudy (anonymous):

isn't #1 A?

OpenStudy (awkwardpanda):

10. what is the 10th term of the sequences 625,125,25,... a. 1/3,125 b. 1/625 c. 1/1250 <---- d.1/15,625 11. what is a possible value for the missing term of the geometric sequence? 37,__, 925,... a. -185 b. -4,625 c.-925 <--- d. 481

OpenStudy (nikato):

1. is not correct. what will be the first term of the sequence which is when you plug in 1 for n so 6(1)+1=?

OpenStudy (awkwardpanda):

7?

OpenStudy (nikato):

yes. and which choice contains it?

OpenStudy (awkwardpanda):

A.

OpenStudy (awkwardpanda):

Are the rest correct?

OpenStudy (nikato):

yes A is correct. #3 is wrong. what is the general arithmetic sequence formula?

OpenStudy (awkwardpanda):

\[a _{n}=a _{1}+(n-1)d\]

OpenStudy (awkwardpanda):

It would be A then. @nikato

OpenStudy (nikato):

correct

OpenStudy (awkwardpanda):

WOO! Is anything else wrong?

OpenStudy (nikato):

ok. 7 is right. but im confused 8. what is your equation for it or how did you get it? because i got something that isnt even one of your choices

OpenStudy (awkwardpanda):

I was confused at #8 too. Honestly, I guessed.

OpenStudy (awkwardpanda):

I'll figure that one out later, is #10, #11 right?

OpenStudy (awkwardpanda):

@nikato

OpenStudy (nikato):

10 is not correct. what is the geometric equation for the sequence?

OpenStudy (awkwardpanda):

I forgot .-.

OpenStudy (nikato):

|dw:1394507983525:dw|

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