The change in chandra's account balance over a 5-month period is −$860 . what is the average change in chandra's account balance per month over this period?

-$172

Step-by-step explanation:

If the change in Chandra's account balance over a 5-month period is −$860, her average change o'er month (i.e for one month) over the period will be -$860/5

= -$860/5

= -$172

It is like taking the mean of the total balance i.e average balance for 5months/total number of months

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared