Question

helpp

Answer 1

@mathstudent55

Answer 2

Which problems from which sheet?

Answer 3

umm all of them pleazz

Answer 4

Ok. Let's start with the first sheet.

Answer 5

You need to be careful when comparing areas. Here's an example. If you have a square with side 2, what is its area?

Answer 6

4

Answer 7

Now if you have a square with twice the side, 4, what is its area?

Answer 8

8

Answer 9

wat r u doing problem 29?

Answer 10

No. Area of square = side squared

Answer 11

16

Answer 12

I'm giving you a background explanation for problem 28.

Answer 13

oh

Answer 14

Correct.
Square with
Side 2, area 4
Side 4, area 16
When the side went from 2 to 4, the side became 2 times bigger. The area went from 4 to 16 and became 4 times bigger.

Answer 15

Now if the side of the square becomes 3 times the original side. The side was 2. Now the side becomes 6. What is the area of the square?

Answer 16

12?

Answer 17

No. Area is not side times 2, it's side squared
6^2 = 36

Answer 18

oh yeahh....so its 36%?

Answer 19

We're not dealing with percentages yet.
Just look at numbers below. When the side goes from 2 to 6, the side became 3 times bigger. The area goes from 4 to 36. How much bigger did the area become?
Square with
Side 2, area 4
Side 6, area 36

Answer 20

36 is how many times 4?

Answer 21

9

Answer 22

Right. So if you incerase the side by 3, you increse the area by 3^2 = 9 times.
The same happens in problem 28.
If the radius is 3 times smaller, the area id 9 times smaller.

Answer 23

Area of a circle with radius 3:
A = (p)ir^2 = (pi)*3^2 = (pi)*9 = 9(pi)
Area of circle with radius 1:
A = (pi)r^2 = (pi)*1^2 = (pi)*1 = pi
Area of pi is 9 times smaller than area of 9(pi)

Answer 24

For radius 1,
A = pi = 3.14
For radius 3,
A = 9(pi) = 9*3.14 = 28.26
3.14 is what percentage of 28.26?

Answer 25

@Ammarah
Are you still there?

Answer 26

yess

Answer 27

so u dividee

Answer 28

Do you understand problem 28 so far?

Answer 29

3.14/28.26 * 100 will give yout he percentage

Answer 30

okkk next prob...

Answer 31

29. You got the area correct, 2916 yd^2

Answer 32

Now you also need the perimeter.

Answer 33

yes

Answer 34

The feet of fencing needed is the perimeter. You have a square with 4 sides of 54 yd. What is the perimeter?

Answer 35

P=2l +2w

Answer 36

216

Answer 37

Yes, that wroks, but you can make it simpler since this is a square with all 4 sides equal, so P = 4s = 4 * 54 yd = 216 yd

Answer 38

kk so those two are the answers?!

Answer 39

There is one more step. The question asks for feet of fencing not yards of fencing, so you need to convert yards into feet.

Answer 40

There are 3 feet in each yard. How many feet is 216 yd?

Answer 41

@Ammarah
If you want to go through all these problems, you need to keep going bec I'm leaving in about 30 minutes.

Answer 42

ohh idk how many feet..

Answer 43

pleasee stay..

Answer 44

216 divide by 3

Answer 45

72

Answer 46

1 yard = 3 feet. Ok?

Answer 47

72????

Answer 48

i already posted the answer...@mathstudent55 r u there

Answer 49

@mathstudent55

Answer 50

No, it's not 72. Answer my questions quckly.
1 yd = 3 ft, right?

Answer 51

2 yd = 6 ft
3 yd = 9 ft
For every amount of yards in a length, there are more feet in that length.
You multiply yards by 3 to get feet. Don't divide by 3.

Answer 52

ohhkkk

Answer 53

648

Answer 54

648 ft of fencing. Correct.
Next problem

Answer 55

For 30. Can you write the length and width in terms of 20, 24 and x?

Answer 56

L = ?
W = ?

Answer 57

L=20
w=24

Answer 58

Maybe
L = 24 in.
W = 20 in.
That is the length and width of the glass pane without the frame.
The frame is x inches wide all around.
What are the length and width of the window (including the frame)?

Answer 59

20+2x+24+2x??

Answer 60

L = 24 + 2x
W = 20 + 2x

Answer 61

yes thats wat i meant

Answer 62

What is the perimeter of the window using the length and width I just wrote?

Answer 63

P = 2L + 2W

Answer 64

8x+88

Answer 65

i have to do something right now...please tell me if what u get for the problems and i will review themmm

Answer 66

8x + 88 = 8 2/3 ft
8 2/3 ft * 12 = 104 in.
8x + 88 = 104
8x = 16
x = 2
This is the answer for 30.

Answer 67

31.

x = 3.5
2x = 7
3.5 in. and 7 in.