Grade 9

Lesson 3 hand in

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November 17th, 2016 1 Comment Grade 9, PE 9 morgank2016

Lesson 1 active health hand in

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November 9th, 2016 1 Comment Grade 9, PE 9 morgank2016

Everything i know about exponents

1: represent repeated multiplication with exponents:

An example of repeated multplication would be writing/expanding out 2^4 as (2)(2)(2)(2) or 2x2x2x2 or 2•2•2•2

 

2. Describe how powers represent repeated multplication:

Poweres represent repeated multiplication by showing that ex. (5)(5)(5)(5) would be written as 5^4 because it’s saying multiply 5 by 5, 4 times. The exponent is 4 because thats how many times your multiplying the base, which is 5. The exponent is the small number and the base is the larger number. So 5^4 = (5)(5)(5)(5)

 

3. Demonstrate the difference between the exponent and the base:

in a power, there’s an exponent and a base, a little number and a larger number. The little number is the exponent and the larger number is the base. The base is multiplied by itself as many times as the exponent. So if the base is 5 and the exponent is 3, then 5 multiplies by itself 3 times. (5)(5)(5) = 5^3

 

 

4. Demonstrate the difference between two givin powers in which  the exponent and the base are interchanged by using repeated multiplication:

img_0029= 2^3

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= 3^2

so this means that 2^3 is different than 3^2 . 2^3 means you multiply 2 by itself 3 times, so, (2)(2)(2) because the base is 2, and the exponent is 3, and you multiply the base by itself as many times as the exponent tells you to. 3^2 means multiply 3 by itself twice. So (3)(3) so these are two completely different answers. 2^3 = 8 and 3^2 = 9. They do not equal the same answer even though they both use the same numbers.

 

 

5. Evaluate powers with integral bases (excluding base 0) and whole number exponents:

ex. 5^3 = 125

ex. 3^3 = 81

ex. 2^5 = 32

 

6. Explain the role of parentheses in powers by evaluating a given set of numbers such as {(-2)^4} , {(-2^4)} and {-2^4} :

so {(-2)^4} means (-2)(-2)(-2)(-2) = +16

{(-2^4)} means (-1)(2)(2)(2)(2) = (-16)

{-2^4} means (-1)(2)(2)(2)(2) = (-16)

 

7.explain the exponent law for multiplying and dividing powers with the same base:

law for dividing: ex. {4^5/4^3} , you would subtract the exponents while keeping the base as it is so it becomes 4^{5-3} wich equals to 4^2 = 16

law for multiplying: ex. {(2^3)(2^2)} , you would add the exponents while keeping the base as it is so it becomes 2^{3+2} which equals to 2^5 = 32

 

8. Explain the exponent laws for raising a product and quotient to an exponent:

raising product to an exponent would be {(5^2)^3} you would multiply the exponents, you multiply because like any other equation, if there’s a bracketed number next to another number it means multiply ex. 2(5) just means 2×5 = 10. And you multiply the exponents because it follows pemdas or bedmas.so.. {(5^2)^3} = (5)^{2*3} = (5^6) = 15,625

raising quotient to an exponent is the same as dividing same base powers, you subtract the exponents. So 5^4 over 5^2 = 5^{4-2} = 5^2 = 25

 

9. Explain the law for powers with an exponent of 0:

anything to the power of 0 = 1

 

10. Use patterns to show that a power with an exponent of zero is equal to one:

When the power decreases, the answer divides by it’s base. Ex 2^5 = 32

2^4 , to find the answer you can take 32 from 2^5 And divide it by the base to get the answer for 2^4 = 16 this means you would divide 32 by 2(base) to get 16

same with 2^3  to get the answer you can divide 16 by 2 = 8   2^3 = 8

2^2 = 8/2 = 4. 2^2 = 4

2^1 = 4/2 = 2. 2^1 = 2

then to get 2^0 , you continue on the rule, you find the answer for 2^1 Which is 2 and divide it by the base which is 2 in this case. So 2^0 = 2/2 = 1. 2^0 = 1

 

11. Explain the law for powers with negative exponents:

the law for negative exponents is the same for any base except zero. If the base is raised to a negative exponent, you must reciprocal the base so then the exponent becomes positive.  Ex. 2^{-2} over 5, you would change it so 5 is now over 2, which makes the exponents positive. Then you complete the equation, in this case you would do 5^2 = 25. Then divide the numerator by the the denominator so 25/2=12.5

 

12. Use patterns to explain the negative exponent law:

For example 2^{-3} you would reciprocal the base. It becomes 1^3 over 2, then you just solve it how you normally would. It becomes 1 over 3 because before, it was just 3 and 3=3 over 1

 

13.

I can apply the exponent laws to powers with both inegral and variable bases:

when solving powers with variables as bases, you always follow the same rules as if the base were a number but you may not be able to solve the equation completely

ex. x^2 = x^2 there is no different ce between the power and the answer because it can’t be solved any further.

ex. y^4 x y^3 = y^7 This is the final answer because you can’t multiply Y by itself 7 times and get an answer further than this answer.

ex. n^5 divided by n^3 = n^2 This is the final answer because you can’t multiply N by itself twice and get an sneer further than this answer.

 

14. I can identify the error in a simplification of an expression involving powers:

I will spot the error in the equation below and correct it-

(2^2)(2^3) = 2^6 this answer is wrong.

(2^2)(2^3) = 2^{2+3} = 2^5

 

15. Use order of operations on expressions with powers:

when following the order of operations with powers, we always use bedmas.

ex. 2^4 x 4^3 = 2x2x2x2 = 16, 4x4x4 = 64, 16×64=1024

Ex. 2(4^2) = 4^2 = 4×4= 16. 2×16= 32

16. Determine the sum and difference of two powers:

adding powers ex. 4^3+2^5 = (4x4x4) + (2x2x2x2x2) = 64+32= 96

subtracting powers ex. 3^3-6^2 = (3x3x3) – (6×6)  = 27-36= -9

 

17. Identify the error in applying the order of operations in an incorrect solution:

3(6^3) = 18^3 this is wrong because with order of operations, you always do the exponent before you multiply.

3(6^3) = 6x6x6 = 216. 216 x 3 = 648

 

18. Use powers to solve measurement problems:

Imagine a shaded square with each side 5cm, and a smaller, white square with each side 2cm sitting inside the shaded square. how do you find the area of the shaded part? Well Area=LxW, because we are talking about perfect squares, LxW is the same as saying To the power of 2. for the larger square so 5^2 = 25. Then the smaller white square, 2^2 = 4. So to find the shaded part you subtract them, 25- 4 = 21. Area of the shaded part = 21cm^2

 

19. Use powers to solve growth problems:

Ex. There are 20 people at a concert. The amount of people doubles ech hour, how any people will there be in ____ hours?

2 hours?

20 x 2^2 = 20 x 4= 80 people. In 2 hours there will be 80 people

4 hours?

20 x 2^4 = 20 x 16 = 320 people in 4 hours

6 hours?

20 x 2^6 = 20 x 64 = 1280 people in 6 hours

etc.

 

20. Applying the order of operations on expressions with powers involving negative exponents and variable bases:

A power involving a variable base with a negative exponent would be:

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November 9th, 2016 4 Comments Grade 9, Math 9 morgank2016

LateX coding

Example 1: exponent:

5^2

Example 2: two digit exponent:

5^{20}

example 3: fractions

\frac{3}{5}

example 4: adding operations:

3x^2\cdot5x^7 3x^2\div5x^7

Example 5: change size:

6^{-5}

Example 6: change text color

6^5

Example 7: change background color:

5^3

 

November 4th, 2016 Leave a comment Grade 9, Math 9 morgank2016

TOKTW 2016

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November 3rd, 2016 1 Comment Grade 9 morgank2016

Science app reveiw

I chose to do my app reveiw on “periodic table quiz”

This app is free and is available on ios and android devices. It takes you to different levels of timed multiple choice quizzes which are all on different parts of the periodic table. Your score depends on the amount of time you finish each quiz in. The time counts down and the amount of time you have left after you complete the quiz determines your score. This app is very useful for learning about the periodic table. It helps you learn alot about the period tale from the element symbol, to the group the element belongs in, to the charge the element has and so much more. It’s basically an app that helps you memorize the information on the periodic table, it’s very useful if you were to study for a chemistry test or quiz. There are a number of levels and each level gets harder and harder but it improves your memorization. Even if you weren’t using this app to study for a quiz you could also use it just to learn about the periodic table in general, it’s a good app for either uses and i would recommend it if your wanting to memorize the periodic table.

define: in my opinion the problem that i occurs is that for each quiz it doesn’t tell you what the quiz is on. Ex. Element element charge. There are a few of quizzes with in this app on the element charge and in the egining of each quiz, it didn’t tell me what the quiz was based on, so when i started it, there were just a bunch of numbers for answer  a b c and d and it was hard to figure out what the quiz was based on.

dream: when we were doing our periodic table unit in science class, i found it not to hard but when i was studying for the unit test it was a little difficult to study off of the periodic table. I had thought of using an app to study and then i found this one and did pretty good on my test! This app helped me study and i repeated the quizzes until i could answer each question without having hesitation

Deliver: because i used this app to study for my test, my results were pretty good as my score on the test and i would not regret using this app to study

debrief: i believe this app did what it was supposed to do but i waited last minute to use this app and next time i would use my spare time wisely because this app is sort of time consuming because it involves memorization. It depends on how fast you learn but either way there are alot of levels so it could take some time to get through them (more…)

October 27th, 2016 1 Comment Grade 9, Science 9 morgank2016

TED Talk – Industrial Revolution

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October 20th, 2016 Leave a comment Grade 9, Socials 9 morgank2016

My digital footprint

My digital footprint

When I searched my name into google my digital foot print seemed to be pretty clean, I didn’t find anything that showed a negative impact on my future. I found mostly sites that had to do with my previous gymnastics competitions including scoring, news articles and things on my clubs website. I also found a few previous posts from Pinterest and profile picture from Facebook and Facebook family tree posts that my mom had tagged me in.

A digital footprint could affect my future opportunities in a positive or negative way depending 0n my past. For example, if i or someone
else were to find something negative on the internet when searching my name it could decrease my chances of getting into a good collage/university then job and affect my whole career throughout my entire life and it would be hard to make up for that and gain trust w important people. Also if i were to get into any trouble in the future involving court of law i would be more likely to loose if i had negative things on my digital footprint.

To keep my digital footprint appropriate and safe i need to make sure that I don’t post or do anything bad online or that would offend someone because anything you do or say online stays there forever
and anyone can pull up evidence of your actions whenever they want and use it to their advantage. You need to be careful when texting online or through a comment section because people can take your words the wrong way in a way that you didn’t mean and screenshot it. Always read the terms and conditions before using a new site or social media and always check if the privacy settings are on. Also always think about what your about to do before you post it and if it will affect your future and how it would affect it.

If I could pass one thing off to to other students on what I’ve learned about a digital foot print, I would tell them to always think about
what their doing online before they make an action that everyone can see because whatever you post will affect your future and you don’t want it to affect your future in a bad way so to just be careful.

October 3rd, 2016 Leave a comment Grade 9 morgank2016

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