2. WARM UP BIKE SAFETY: You live near a mountain bike trail. You can rent a mountain bike a safety helmet for $10 an hour. If you have your own helmet, the bike rental is $7 an hour. You can buy a helmet for $28. How many hours do you need to use the trail to justify buying your own helmet? 5 Minutes Remain

3. WARM UP BIKE SAFETY: You live near a mountain bike trail. You can rent a mountain bike a safety helmet for $10 an hour. If you have your own helmet, the bike rental is $7 an hour. You can buy a helmet for $28. How many hours do you need to use the trail to justify buying your own helmet? 4

4. WARM UP BIKE SAFETY: You live near a mountain bike trail. You can rent a mountain bike a safety helmet for $10 an hour. If you have your own helmet, the bike rental is $7 an hour. You can buy a helmet for $28. How many hours do you need to use the trail to justify buying your own helmet? 3

5. WARM UP BIKE SAFETY: You live near a mountain bike trail. You can rent a mountain bike a safety helmet for $10 an hour. If you have your own helmet, the bike rental is $7 an hour. You can buy a helmet for $28. How many hours do you need to use the trail to justify buying your own helmet? 2

6. WARM UP BIKE SAFETY: You live near a mountain bike trail. You can rent a mountain bike a safety helmet for $10 an hour. If you have your own helmet, the bike rental is $7 an hour. You can buy a helmet for $28. How many hours do you need to use the trail to justify buying your own helmet? 1

7. WARM UP BIKE SAFETY: You live near a mountain bike trail. You can rent a mountain bike a safety helmet for $10 an hour. If you have your own helmet, the bike rental is $7 an hour. You can buy a helmet for $28. How many hours do you need to use the trail to justify buying your own helmet? 0

8. Grab a textbook, open to page 171 for lesson 3.7, Formulas.