Anticipatory Set/Opening Activity: Transparency 3-8
State whether each percent of change is a percent of increase or decrease. Then find the percent of change. Round to the nearest whole percent.
1. original: 84, new: 96

2. original: 47, new: 18

3. Find the discounted price of a tent with a price of $89 and a discount of 15%.


4. Find the discounted price of a pair of hiking boots with a price of $78, a discount of 10%, and a tax of 6%.


5. On July 1, a stock sold for $46 per share, and on August 1, it sold for $48.30 per share. What was the percent of change in the price of the stock?


6. A car sales person had sales of $85,000 one week, and a 15% decrease in sales the next week. Which proportion could be used to find the amount of sales �s� the second week?


A. (s/85,000) = (15/100)     B. (85,000 � s/85,000)= (15/100)     C. (85,000/85,000 +s)= (15/100) &nbps;   D. (85,000 +s/(85,000)= (15/100)

Specific Lesson Outline and Notes
Solve for variable: get variable alone on one side of =

Ex1: Solve 3a + 17=2 for a

Ex2: Solve 5b + 12c=9 for b

Ex3: Solve 7x � 2z= 4 - xy for x (hint: distributive property)

Formulas help solve problems with a specific variable.

Ex4: A car�s fuel economy E (miles per gallon) is given by the formula E= (m/g), where m is the number of miles driven and g is the number of gallons of fuel used.

a. Solve the formula for m


b. If Claudia�s car has an average fuel consumption of 30 mpg and she used 9.5 gallons, how far did she drive?

Dimensional analysis: process of carrying units throughout a computation.

Ex5: The formula for the volume of a cylinder is V=PIEr2h, where r is the radius of the cylinder and h is the height.

A. Solve the formula for h.


B. What is the height of a cylindrical swimming pool that has a radius of 12 feet and a volume of 1810 ft³

Homework p. 168 # 1,2,15-30 (3rd), 31-35,38,39,41
Quiz 3: 4-6