ennifer has been saving for college for 57 months. The first month, she saved $11. She was able to save more money each month than the month before. She ended up saving $19,779.00. How much more did she save each month?

$11.00
$11.50
$12.00
$12.50

Question

ennifer has been saving for college for 57 months. The first month, she saved $11. She was able to save more money each month than the month before. She ended up saving $19,779.00. How much more did she save each month?

 $11.00
 $11.50
 $12.00
 $12.50

anonymous · Answer

PLEASE HELP ILL GIVE MEDALS

anonymous · Answer

@freckles

freckles · Answer

so first month we saved 11 dollars
how much did she saved the next month?

anonymous · Answer

idk im very confused

freckles · Answer

is that the whole question?
it doesn't say how much was saved each month

freckles · Answer

or state a relationship between consecutive months

anonymous · Answer

ya its the whole question

freckles · Answer

There doesn't seem to be enough information.
There is no relationship given between the months...

freckles · Answer

we could try to assume we have an arithmetic series
and that the difference between each consecutive month is constant

freckles · Answer

but the question doesn't say to assume this

freckles · Answer

11,11+d,11+2d,...,11+nd
$$\sum_{i=0}^{n}(11+di)=19779$$
there are 57 months so n actually equals 57
$$\sum_{i=0}^{57}(11+di)=19779$$

freckles · Answer

but there is no real relationship
it just saved Jennifer saved more and more which doesn't imply there is a common difference