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8090 [49]
3 years ago
9

I need help with math, I have no idea what I'm doing

Mathematics
1 answer:
Masteriza [31]3 years ago
5 0
A. (x+3)(4x+5)
(multiply x with 4x+5 then multiply 3 with 4x+5)
=4x^2+5x+12x+15
=4x^2+17x+15
b,c, and d are similar
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The diagram shows a circular pond, of radius r metres, surrounded by a circular path.The circular path has a constant width of 1
Alenkasestr [34]

The formula for calculating the area of a circle is expressed as;

A = πr²

  • Area of the pond = πr²
  • Area of the path = Area of the path + pond - area of pond
  • Area of path = π(r+1.5)² - πr²

Since the  area of the path is equal to the area of the pond, hence;

π(r+1.5)² - πr² = πr²

Add πr² to both sides

π(r+1.5)² - πr² + πr² =  πr² + πr²

π(r+1.5)² = 2πr²

(r+1.5)² =   2r²

Expand the parenthesis

r²+3r + 2.25 = 2r²

r²+3r + 2.25 - 2r² = 0

-r² + 3r + 2.25 = 0

r² - 3r - 2.25 = 0

Multiply through by 2

2r² - 6.0r - 4.5 = 0

<em>This proves the required equation</em>

<em />

Learn more on area of composite figures here: brainly.com/question/15981553

3 0
3 years ago
The 7 in 507.3 has ten times the value of the 7 in?<br> Is it 12.007, 725, 67 or 30.76.
defon
I believe the answer would be 30.76
4 0
3 years ago
The Chinese system presented in the text has symbols for 1 through​ 9, and also for​ 10, 100, and 1000. What is the greatest num
Naddika [18.5K]
To get the biggest possible number, use all the symbols at once. 1000+100+10+9+8+7+6+5+4+3+2+1=what?
4 0
3 years ago
May I have help on This question please I’m being Timed
Licemer1 [7]

Answer:

i belive it is 1,3,4,5

Step-by-step explanation:

4 0
4 years ago
Triangle ABC is dilated with a center at the origin and a scale factor of 2. What are the coordinates of triangle A’B’C’?
Vaselesa [24]
Well as it looks like to me the cords of the a,b,c are 2,3,1
8 0
3 years ago
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