1. Bellringer: Cody bought a new truck for $25,000. He took out a loan for 5 ½ years with 7.75% APR. How much will Cody end up paying in interest? 7.75% =. 0775 I = prt I = $25,000 x.0775 x 5.5 I = $10,656.25

2. Using Formulas

3. Goal: 1.Plugging numbers into formulas. We use formulas to calculate values. 2.Use the formula d = rt to solve for different values.

4. Vocabulary Formula – is an equation that shows the relationship between quantities represented by variables. Distance traveled: d = rt (rate X time)  ALL FORMULA PROBLEMS are solved the same way. PLUG what you know into the formula. SOLVE for what you don’t know.

5. Questions, questions…. How does a track coach figure out how fast someone is….? Distance traveled: d = rt (rate multiplied by time)  ALL FORMULA PROBLEMS are solved the same way. PLUG what you know into the formula. SOLVE for what you don’t know.

6. Examples Use Distance = Rate times Time to solve.. Distance = Rate x Time (d = rt) Suppose you ride your bike at 10 miles per hour for 3 hours. How far did you bike? We have already done stuff like this! Put the number in for the variable/letter and solve for the ONLY thing left!

7. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Suppose you ride your bike at 8 miles per hour for 4 hours. How far did you bike? We have already done stuff like this! Put the number in for the variable/letter and solve for the ONLY thing left!

8. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Suppose you ride your bike at 12 miles per hour for 2 hours. How far did you bike? We have already done stuff like this! Put the number in for the variable/letter and solve for the ONLY thing left!

9. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Suppose you ride your bike at 5 miles per hour for 10 hours. How far did you bike? We have already done stuff like this! Put the number in for the variable/letter and solve for the ONLY thing left!

10. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Now suppose you rode your bike for two hours and went 18 miles. How fast did you go?

11. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) What if you rode your bike for 3 hours and went only 12 miles. How fast did you go?

12. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) What if you went 10 miles on your bike and you know you went 5 mph. How long did you ride?

13. Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) How about you went 21 miles on your bike and you went 3 miles per hour. How long did you bike?

14. How can you remember how to use Distance = Rate x Time?

15. Using Formulas Worksheet

16. Tia saved her $9,000 for 2 ½ years at 4.25% APR in a CD, to go on a month long vacation with her family. How much did she earn in interest? 4.25% =. 0425 I = prt I = $9,000 x.0425 x 2.5 I = $956.25

17. Bellringer: Find the simple interest and the balance. Balance =P+I 2000+60 Balance = $2060

18. Exchange homework 1.6x10=607. 20/10=2 2.8x8=648. 40/8=5 3.2x2=49. 6/2=3 4.24/6=410. 12/2= 6 5.24/8=311. 2x5=10 6.24/2=1212. 80/40=2

19. Hands Down You will be playing in groups of 2. You will take turns taking a card off the pile. Solve the problem, all the answers are on the board. When you get the answer, hit the answer on the board, the team that hits first gets a point. If you don’t agree on the answer, check the answer sheet. The team with the most points win.

20. Jeopardy http://www2.gcs.k12.in.us/jpeters/distance.h tmhttp://www2.gcs.k12.in.us/jpeters/distance.h tm