There are 12 baseball trading cards in 4 packages. each package has the same number of cards. write a rule in words for the number of packages justin needs to buy to get x cards. then write the rule as an algebraic expression.

        The number of packages Justin needs to buy to get x cards is x divided by 3.

Explanation:

This is a direct variation problem.

Since  each package has the same number of cards, the number of cards is proportional to the number of packages.

12 baseball cards in 4 packages means that there are 12/4 = 3 cards per package, so:

So, the rule in words for the number of packages Justin needs to buy x cards is one third of x. This table may help you to visualize it:

Number of packages:   1     2     3      4    5

Number of cards:          3     6     9    12    15

To find the algebraic expression that describes the same rule, you can set the following proportion:

Where y is the number of packages and x is the number of cards.

And from that you solve for y:

the 1st digit is in the 100s n its 1

step-by-step explanation:

3,589÷18 = 199.389

so the first digit of the quotient is in the 100s n its 1