Chapter 8

13) 2x+y=6

y=6-2x

14) 5x+y=7

y=7-5x

15) 3x+2y=8

8-3x=2y

16) 2x+5y=10

5y=10-2x

Population %

1. Find the most current U.S. population of females or males
females 5,840,878

2. What was the U.S. population of females or males ten years ago
females 5,620,775

3. Find the percent increase/decrease.
3.92% increase

4. Based on the percent increase/decrease, with a population of 1000 people, how many females or males would there have been five years ago?
528.33 females

5. Find the percent of increase or decrease for these categories:

a) under 5 years old
3.85% decrease


b) between 10-14 years old
7.95% increase


c) over 85 years old
28.08% increase

Percents%

1) 1200/540=.45 or 45%

2).06x1200=$72

3) 200/1200=0.166 or 17%

4) 40x4=160
160/1200=0.133 or 13%

5) 0.6x1200=$720

entertainment-$720

0.4x1200=$480

savings=$480

New Gas Price Cost

Part One
If the gas prices are $2.20 you would do the same thing as you did in the other paragraph except you replace the old gas price with the new one. you would multiply the cost with the amount of gallons it holds and you would get $29.70. After that you would subtract the numbers to see how much you saved. $39.96-$29.70=$10.26 so I saved over $10. answer: $10.26

Part Two
On that website I learned a lot like why gas prices are suddenly falling again it is because next month there will be a greater supply of gas because of a hurricane coming upstream. I also learned that every one dollar decrease in the gas price it saves $1billion for consumers. The economy is headed downward though.

Poly-What?

In the movie I learned that 4x+3y can't be reduced any farther because the are unlike terms before I thought that it would be reduced to 7xy. It also helped make polynomials a little more clear. And I learned where the name polynomial came from!

assignment #5

The first artical I chose was back to school shopping bargains I chose this artical because I love back to school shopping and it seemed like an artical that would interest me. This artical relates to me because mostly all summer I am looking for new stuff to wear for school. I learned that there are many stores like Once Upon a Child and Plato's Closet that sell close way cheaper. They have close from Gap American Eagle and Tommy Hillfiger. The second aartical I chose was Local babysitting co-ops growing in numbers. I chose this artical because I babysit. This articalrelates to me because I babysit. I learned what a babysitting co-op is, it is when you earn points for babysitting for someone and then you use your points to get someone to babysit for you. These two paragraphs were very interesting and fun to read.

My Car Expenses

1) You spend 150 miles going to work if you work 5 days a week. I got this answer because 30 minutes times 5 days a weekis 150 miles. If you are getting miles per week there and back that's double as much so your answer would be 300 miles per week. If you were working weekends too your answer would be 420.

2) It would cost me $19.92 because my car would get 52 mpg and 52 divided by 320 is 6.15 and that times $2.96 (the gas price) is $19.96.

3)I am now interested in a hybrid car because with a honda accord I would have to make a lot of trips to the gas station.