Question

7. A major US city reports a 12% increase in decoration sales during the yearly holiday season. If decoration sales were 8 million in 1998, how much did the city report in total decoration sales by the end of 2004? (1 point)

Answer 1

I just dont know how to explain why you would solve this with a geometric series formula

Answer 2

the directions dont even say you need to solve, only that you need to explain why you use the formula that you do

Answer 3

8 million * 0.12 = increase /year
now multiply it with number of years between 1998 to 2004
then add it to 8 million :)

Answer 4

but how would you explain why you used the geometric series formula for this specific problem

Answer 5

isnt it arthmetic?

Answer 6

oh i thought it was geometric series

Answer 7

No the increase will be different each year because the percentage increase is accumulated each year and that will affect the outcome of the next year so yes @iamawfulatmath3 I think you are right that it might be a geo series

Answer 8

no it is arthmetic as always every year 12% of amount is added

Answer 9

oh okay perfect thank you!

Answer 10

The increase will not be the same the first year as it would be the second year so it's not arithmetic

Answer 11

For example let's say that initially we had 100 the first year....a 12% increase will be 112 for the second year

You then have to take a 12% increase of 112 not 100 for the third year.

Answer 12

A fireplace contains 46 bricks along its bottom row. If each row above decreases by 4 bricks, how many bricks are on the 12th row?

Answer 13

so this one would be arithmetic sequence right

Answer 14

because the amount of decrease remains the same and the ratio between the set of numbers stays the same aswell?

Answer 15

yes you are correct.