Warmups

1
Warmups

• A tree casts a shadow 8 feet long. At the same
  time, a flagpole 10 feet tall casts a shadow 15
  feet long. How tall is the tree?
• Find I, if p 950, r 9, t 6 months
• Find r, if I 912, p 7600, t 4 years

2
4-5 Percent of Change

• Objective To solve problems involving percent of
  increase or decrease.

3
Percent of Change

• Percent Increase new amount/price goes up
• Percent Decrease new amount/price goes down
• Example 1 Mac reduced the price of the nano
  ipod from 179 to 139. What is the percent
  decrease?
• Amount of decrease _x_
• Original 100

(Big - small )
4
Another method ?

• You can also divide the fraction in your
  calculator and then change the decimal to a
  percent (do example 1 with this method)

5
Example 2

• Ms. Lundblads groovy math club on campus had 56
  members last year. This year there are 137
  members. What is the percent increase?

6
Try with a Partner

• Increase or decrease? Round to nearest whole
  percent
• 3. original 62 4. original 322 people
• new 98 new 289 people

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TOO

• 5. original 212
• new 230
• 6. Find t, if I 1400, r 7, p 625
• Answers
• 8 increase
• 32 years

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Homework

• Pg. 225 12-20 All

9
Math Lab Warmups

• A tree casts a shadow 6 feet long. At the same
  time, a flagpole 9 feet tall casts a shadow 21
  feet long. How tall is the tree?
• Find I, if p 650, r 3, t 9 months
• Find r, if I 250, p 5400, t 4 years

10
ZONK TIME!!

• Everything away
• Whiteboard, sock, marker..
• GOOOOOO!