Question

Is the sequence –9.9, –13, –16, –19.2, ... arithmetic? If so, identify the common difference.

yes, –3.2

yes, –2.9

yes, –3.1

no
I think it is c

Answer 1

@sweetburger

Answer 2

@surjithayer

Answer 3

?

Answer 4

I don't think c is correct as the 3rd number of the sequence would have to be -16.1

Answer 5

-13-(-9.9)=-13+9.9=-3.1
-16-(-13)=-16+13=-3
-19.2-(-16)=-19.2+16=-3.2
now you can judge whether it is an arithmetic sequence or not.

Answer 6

Please determine what the difference is between -9.9 and -13, -13 and -16, and so on. If the difference is not the same from one to the next, this is not an arith sequence.

Answer 7

So it is D @surjithayer

Answer 8

correct.

Answer 9

Ok I have one more that i think I have the answer for could you please check @surjithayer

Answer 10

sure i will try.

Answer 11

Write an explicit and a recursive formula for the sequence –7, –5.6, –4.2, –2.8, –1.4, ....

explicit: an = –8.4 + 1.4n;

recursive: an = an – 1 + 1.4, where a1 = –7

explicit: an = –8.4 + 1.4n;

recursive: an = an – 1 + 1.4n, where a1 = –7

explicit: an = –7 + 1.4n;

recursive: an = an – 1 + 1.4n, where a1 = –7

explicit: an = –7 + 1.4n;

recursive: an = an – 1 + 1.4, where a1 = –7
I think it is a

Answer 12

@surjithayer

Answer 13

correct.

Answer 14

Thank You!

Answer 15

yw