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7.75% = . 0775

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. Using Formulas. Goal:.

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7.75% = . 0775

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  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: • Plugging numbers into formulas. We use formulas to calculate values. • Use the formula d = rt to solve for different values. Using Formulas

  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 useDistance = Rate x Time?

  15. UsingFormulas 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 Balance = 2000 + 60 Balance = $2060

  18. Exchange homework • 6x10=60 7. 20/10=2 • 8x8=64 8. 40/8=5 • 2x2=4 9. 6/2=3 • 24/6=4 10. 12/2= 6 • 24/8=3 11. 2x5=10 • 24/2=12 12. 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.htm

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