Ella bought some key chains and spent a total of $15. Each key chain cost the same whole-dollar amount. She bought between 4 and 9 key chains. How many key chains did Ella buy? Ella bought key chains

5

Step-by-step explanation:

Total amount spent = $15

Number of chain purchased is between 4 and 9

Cost per chain is a the same (whole dollar)

Number of Chain purchased = (total cost / cost per chain)

Since the total cost = $15

The only whole number value which can divide $15 without a remainder and give a value between between 4 and 9 is 3.

Therefore, cost per chain = $3

Hence, number of chain purchased = $15 / $3

= 5

the dimensions are:

step-by-step explanation:

we want to find the dimensions of a rectangular box with volume of

we factor to obtain;

we rewrite the rightmost factor to obtain;

recall that:

we apply difference of two squares formula to obtain;

hence the dimensions are