Question

What is the formula for the arithmetic sequence shown in the graph?

http://www.explorelearning.com/ELContent/gizmos/ELMath_Deliverable/ExplorationGuides/Algebra/images/EL_A2_ArithmeticSeq2.gif

A. an = -0.5 + (n – 1)(-4)
B. an = 0.5 + (n – 1)(-4)
C. an = -4 + (n – 1)(-0.5)
D. an = -4 + (n – 1)(0.5)

Answer 1

Well it starts on -4 so you can cross out the top 2

Answer 2

Arithmetic series equation =

an=a1+(n-1)d

where a1 is your first term and d is the difference between the numbers.

Answer 3

And the graph is increasing so we know the difference is not negative.

So what's our answer?

Answer 4

the 0.5 is the slope of the graph (7/14)

Answer 5

Its D? :)

Answer 6

right

Answer 7

Yes it is D :)

Answer 8

lol okay thank you!