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Alex777 [14]
3 years ago
10

If 9(x - 9) = -11 then x =?

Mathematics
1 answer:
Leokris [45]3 years ago
3 0

Answer:

70/9

Step-by-step explanation:

9x-81 = -11              *distribute the 9

9x = 70                  *add 81 to the other side - isolate the x

x = 70/9

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A community pool that is shaped like a regular pentagon needs a new cover for the winter months. the radius of the pool is 20.10
inn [45]

The area of the pool that needs to be covered is 960.42 square feet.

<h3>What is Pythagoras theorem give example?</h3>
  • To determine the undiscovered side of a right-angled triangle, utilize the Pythagoras theorem.
  • The hypotenuse (third side) of a right-angled triangle, for instance, can be determined using the formula c2 = a2 + b2, where 'c' stands for the hypotenuse and 'a' and 'b' are the two legs.

According to the question:

  • We have been given that a community pool that is shaped like a regular pentagon needs a new cover for the winter months.
  • To find the area of community pool we will use area of pentagon formula.
  • Area of pentagon=\frac{1}{2} a * p$ , where, a represents the apothem or perpendicular distance from the center of the pentagon and p represents perimeter of pentagon.

Let us find the perimeter of our given pentagon by multiplying each side length by 5.

Perimeter of community pool $=5 \times 23.62\\Perimeter of community pool $=118.1$

Now let us find apothem of our pentagon by using Pythagoras theorem.  

a^{2}=20.10^{2}-11.81^{2}\\$a^{2}=404.01-139.4761\\$a^{2}=264.5339\\$a=\sqrt{264.5339}\\$a=16.2645$

Upon substituting our given values in above formula we will get,

Area of community pool =\frac{1}{2} \times 16.2645 \times 118.1\\Area of community pool $=8.13224907 \times 118.1\\Area of community pool $=960.418615627971 \approx 960.42$

Therefore, the area of the pool that needs to be covered is 960.42 square feet.

Learn more about Pythagoras theorem here:

brainly.com/question/343682

#SPJ4

7 0
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vovangra [49]
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Which decimal Best represents 27.2%
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To write a percent as a decimal you move the decimal point two spaces to the left. Therefore the decimal best representing 27.2% would be .272

6 0
3 years ago
A rectangle has a perimeter of 48m. The width is 2m less than the length. Using an equation find the dimensions.
Anna [14]
Ok so we know that the total perimeter of the rectangle is 48m.

We also know that to get the perimeter, it is the sum of two lengths and two widths.

Therefore 2L + 2W = 48

However, we also know that the width is 2m less than the length, so the above equation can be rewritten as:
2L + 2(L-2) = 48

We can simplify this to make it
4L - 4 = 48
So 4L = 52
Hence L = 13.

We know that the width is 13-2, so the width is 11.

So the length is 13m and the width is 11m

Hope this helped
5 0
4 years ago
Write a plan to prove that angle 1 is congruent to angle 2
skad [1K]

Answer:

alternate interior angles

Step-by-step explanation:

<1 is congruent to <2 by alternate interior angles

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