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University Prep Math

University Prep Math. Steve Greer sgreer@staff.ednet.ns.ca hrsbstaff.ednet.ns.ca/ sgreer. Order of Operations: When to do what. B E D M A S. I V I S I ON. DD I T I ON. R A C K E T S. X P ON E N T S. U B T R A C T I ON. U L T I P L A C T I ON.

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University Prep Math

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  1. University Prep Math Steve Greer sgreer@staff.ednet.ns.ca hrsbstaff.ednet.ns.ca/sgreer

  2. Order of Operations: When to do what B E D M A S I V I S I ON DD I T I ON R A C K E T S X P ON E N T S U B T R A C T I ON U L T I P L A C T I ON

  3. “Evaluating an Expression” examples Evaluate the following expressions given the value of the variable stated. 7x-3 if x = 7 2. 10(x-2) if x = 4 3. 5r -7t -6 if r = 2 and t = 1 4. 3t2 +5t -9 if t = 2 3x(x-2) + x/2 if x = 4 6. if j = 3 Answers: 1. 46 2. 20 3. -3 4. 13 5. 26 6. 1

  4. Answers: 6 2) -5 3) 11 4) 10/6 = 1.67 5) 26 6) -3 Find the root of each equation. 1) 5(x-4) = 10 2) 8w – 2 = -42 3) ½ (g+1) = 6 4) 3x + 6 = 9x – 4 5) 6)

  5. Where do these functions come from? We have worked with a few expressions and a few equations but what do they mean? Let’s look out how our every day lives use functions all the time!

  6. Cell Phone Bill – A function What are two variables involved in cell phone use? We can find a relationship between the cost of the bill and the time of usage. Which variable depends on the other? Let’s say that it costs 20 cents per minute and that you are always charged a monthly fee of $7.00. Questions: 1) What is the function and its graph? 2) If you talked for 45 minutes, what will your bill be? 3) If your bill is $37.40, how many minutes were you on the phone?

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