Page 311 - Algebra 1

Example
4
Olympics
In the 2002 Winter Olympics, U.S. athletes received a total of 34 medals. In the 2006 Winter Olympics, U.S. athletes received a total of 25 medals. What is the percent of decrease in the number of U.S. Winter Olympic medals?
SOLUTION
34 original amount
34 - 25 = 9 Find the amount of decrease.
9 ≈ 0.26 amount of decrease ___
34 original amount
≈ 26% Write the decimal as a percent.
The percent of decrease is about 26%.
Find the percent of change.
(Ex 1)
a. b.
c.
(Ex 2)
d.
(Ex 2)
e.
(Ex 3)
f.
(Ex 4)
Lesson Practice
January 2006 salary: $600/week
January 2007 salary: $630/week
number of words in the first draft of an essay: 1032 number of words in the final draft of an essay: 774
A shoe store marks up the price of a pair of boots that cost the store $44.00 by 45%. What is the markup and new price of the pair of boots?
A real estate agency is selling a house at 22% off the original cost of $344,000. What is the discount and new price of the house?
A weightlifter can lift 90 pounds. After six months he can lift
125 pounds. What is the percent of increase in the amount of weight he can lift?
Binders that originally sold for $4.95 each are now selling for $3.87 each. What is the percent of decrease in the price of the binders?
Practice
Distributed and Integrated
Solve the equations. Check your answers.
1.
(26)
2.
(28)
3.
(28)
4.
(45)
5.
(9)
296
-(x-3)-2(x-4)=7 3p-4-6=-2(p-5) k+4-5(k+2)=3k-2
Write an inequality for the product of 3.6 and an unknown number that is greater than 18.
Simplify a3x - ⎪x3⎥ for a = -3 and x = -2. Saxon Algebra 1