Which of the following sequences are not geometric?

(check all that apply)

a. 2,10,50,250,1250
b. 1,4,9,16,25,36
c. -4,-2,-1,-0.5,-0.25,-0.125
d. 1,1,2,3,5,8,13,21

Question

Which of the following sequences are not geometric?

(check all that apply)

a. 2,10,50,250,1250
b. 1,4,9,16,25,36
c. -4,-2,-1,-0.5,-0.25,-0.125
d. 1,1,2,3,5,8,13,21

precal · Answer

geometric means that they are multiplying or dividing the same number throughout the sequence

anonymous · Answer

b and d are NOT geometric
a is geometric since 2x5=10, 10x5=50, ....
c is geometric since -4x0.5=-2, -2x0.5=-1, -1x 0.5=-0.5, ...
You have to be able to multiply by the same number to get each successive number in the sequence

anonymous · Answer

oh okay so if that number that its being multiplied by or divided by changes then its not geometric correct?

precal · Answer

|dw:1376432234707:dw|this is an example of one that is geometric