Tuesday, May 30, 2006

*Mackenzie's Third Growing Post*

Question # 1: What is the difference between an algebraic expression and an equation (hint: One contains this and the other doesn't)? Give an example of both an expression and an equation.

In an expression we get to chose the value of the variable Example: 10+20n=
In an equation the value of the variable is given Example: 3+4n=19

Question #2: What is a variable and why do we use one in algebra?

A variable is a letter that represents an unknown number. We use the variable to replace an unknow number.

Question #3: solve for N

A triangle = 5 because two squares = 4 so the whole left hand side of the scale has to equal 9 so the triangle = 5
The right hand side of the scale equals 22 and it is even so one n has to equal 11 because 22 divided by 2 equals 11 and there is 2 ns on the scale.

Question #4: Solve the following questions. Show all of the steps that are needed.

a) 3n + 4n + 7 = 2n + 12
3n + 4n - 2n = - 7 + 12
5n = 5
/5 /5
n = 1

b)8n - (4 + 9) = 11
8n - 13 = 11
8n = 11 + 13
8n = 24
/8 /8
n = 3

c) (8 - 3)n + 7n + 8 =4n +40
5n + 7n + 8 = 4n + 40
5n + 7n - 4n = -8 + 40
8n = 32
/8 /8
n = 4

Question #5: For this question you need to create a T-cahrt and a graph to plot your data from this question on too.

You are having a race against your friend, except you are on foot and he is on his bike. You both know that if you are both on a bike you will be faster so your friend gives you a head start of 3 minutes. If you can run 400m per minute, and your friend can bike 700m per minute, who willbe the first to make it to the finish line 2000m away






1 Comments:

At 5:43 PM, Blogger Mr. Reece said...

You didn't say who won the race, but otherwise the post is excellent.

your mark is 29/30

 

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