Exploring Independent and Dependent Variables in Math

1. Sarah has 5 apples. For every apple she buys, she gives away 2. How many apples does she have after buying x apples? (Identify the independent and dependent variables.)

• x - 5

• 5 - 2x

• 5 - x

• 5 + x

2. A car travels 60 miles per hour. How far will it travel in x hours? (Identify the independent and dependent variables.)

• x miles per hour

• 60x kilometers

• 60x miles

• 30x miles

3. Tom reads 3 books each month. How many books will he have read after x months? (Identify the independent and dependent variables.)

• 3 * x

• 3 + x

• 3 / x

• 3 - x

4. A baker makes 12 cookies for every batch. If he makes x batches, how many cookies does he have? (Identify the independent and dependent variables.)

• 12 + x

• x - 12

• 12 * x

• 12 / x

5. Lisa saves $5 each week. How much money will she have saved after x weeks? (Identify the independent and dependent variables.)

• 5 / x

• 5 - x

• 5 + x

• 5 * x

6. A plant grows 2 inches every week. How tall will it be after x weeks? (Identify the independent and dependent variables.)

• Height = 2 * x + 5 inches

• Height = 2 - x inches

• Height = 2 * x inches

• Height = x + 2 inches

7. A movie theater sells 50 tickets for each show. If there are x shows, how many tickets are sold? (Identify the independent and dependent variables.)

• x - 50

• 50 * x

• 50 + x

• 50 / x

8. A factory produces 100 toys each day. How many toys will it produce in x days? (Identify the independent and dependent variables.)

• 200x

• 50x

• 100x

• x^2

9. A gardener plants 4 flowers in each row. If he plants x rows, how many flowers does he have? (Identify the independent and dependent variables.)

• 4 + x

• 4x

• 16 flowers

• x flowers

10. A train travels 80 miles every hour. How far will it go in x hours? (Identify the independent and dependent variables.)

• 80x miles

• 60x miles

• 100x miles

• 80 + x miles