Question

What are the first four terms of a geometric sequence if the common ratio is 10 and the first term is 4.5? A.4.5, .45, .045, .0045
B.4.5, 9.0, 13.5, 18.0
C.4.5, 14.5, 24.5, 34.5
D.none of the above
I think this is D...?

Answer 1

so keep multiplying by 10 ...
4.5 45 450 4500 45000 ....

I don't see the correct choice, so .....

Answer 2

Great...thanks

Answer 3

you are welcome x three

Answer 4

first term, a = 4.5
common ratio, r = 10

the general form of a geometric sequence is
a , a r , a r ©÷ , a r ©ø , .......... , a r ©ú
.................>>>...where a is the first term,
.................>>>...r is the common ratio,
.................>>>...nth term = a r ^ ( n - 1 )

1st term, a = 4.5
2nd term = a r = ( 4.5 ) ( 10 ) = 45
3rd term = a r ©÷ = ( 4.5 ) ( 10 ) ©÷ = ( 4.5 ) ( 100) = 450
4th term = a r ©ø = ( 4.5 ) ( 10) ©ø = ( 4.5 ) ( 1,000 ) = 4500
5th term = a r^4 = ( 4.5 ) ( 10 )^4 = ( 4.5 ) ( 10,000 ) = 45000

Answer D - none of the above! :)

Answer 5

Unit 5 lesson 1 sequences
1. C
2. B
3. C
4. B
5. D

Answer 6

hal is right for the unit 5 functions lesson 1 sequences quick check