Download lesson 9 proportions.notebook

lesson 9 proportions.notebook
March 15, 2016
Please place homework on your desk.
3/15 Problem of the Day
Common Core Review:
1. A scuba diver standing on a boat is at an altitude of 1.3 meters above sea level. The scuba diver jumps into the water and decreases his altitude by 5.6 meters in one minute. Which equation can be used to determine the scuba diver's altitude, in meters relative to sea level, one minute after jumping into the water?
[A] 1.3 + 5.6 = 6.9
[B] ­1.3 + 5.6 = 4.3
[C] 1.3 + (­5.6) = ­4.3
[D] ­1.3 + (­5.6) = ­6.9
2. Matt and his friends paid $30 for 4 sandwiches and 4 bottles of water.
­Each sandwich cost the same amount.
­The bottles of water cost $2 each.
The equation 4( + 2) = 30 can be used to determine
, the cost of each sandwich.
Matt solved the equation using the following steps:
4( + 2) = 30
4 + 2 = 30
4 = 28
= 7
Matt calculated the cost of each sandwich is $7. Did Matt solve the equation correctly? Explain.
Previous Lesson Review:
3. Beth deposited $1000 into a retirement account when she was 18. How much will Beth have in this account after 50 years at a yearly simple interest rate of 7.5%?
Mar 13­6:20 PM
1
lesson 9 proportions.notebook
March 15, 2016
1. How many sugar packets do you think are inside a 20­oz bottle of soda?
2. Guess as close as you can.
3. Give an answer you know is too high.
4. Give an answer you know is too low.
5. What information will you need to know to solve the problem?
Mar 13­6:46 PM
2
lesson 9 proportions.notebook
March 15, 2016
Mar 13­6:49 PM
3
lesson 9 proportions.notebook
March 15, 2016
Rank the beverages from least to greatest based on their sugar content. Powerade
Minute Maid Orange Juice
Mountain Dew
Dr. Pepper
Mar 13­7:07 PM
4
lesson 9 proportions.notebook
March 15, 2016
3/15 Lesson 9: Proportions
proportion ­ an equation that states two ratios are equal
­Solving using multiplication or division.
2 6
3 x
=
21 24
=
x
8
­Solving using cross products.
y
15
=
12 10
n
8
=
7 10
8 c
=
16 32
Forty­eight pens are packaged in 4 boxes. How many pens are packaged in 9 boxes?
A cell phone company charges $5 for 250 text messages. How much does the company charge for 200 text messages?
Mar 13­7:20 PM
5