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dsp73
3 years ago
13

The Ruffs are planning to buy an above-ground swimming pool shaped as a regular octagon. The radius of the octagon is 9 feet. To

the nearest tenth, find the area of the surface of the water in the pool.
Possible answers:

A) 458.2 ft2
B) 553.1 ft2
C) 94.8 ft2
D) 229.1 ft2
Mathematics
2 answers:
const2013 [10]3 years ago
8 0
Hello ,The answer is A
Ainat [17]3 years ago
7 0
Octagon can be split into 8 equal isosceles triangles Area of octagon will be 8X area of each triangle 360/8 = 45 top angle opposite of base is 45 degrees 180(8-2) = 1080, this is sum of interior angles 1080/8 = 135 135/2 = 67.5 bottom 2 angles opposite of radii are 67.5 degrees to find area of triangle we need base length(x) and height(h) use trig ratios h = 9sin(67.5) x = 18cos(67.5) Area = 8*(1/2)*(9sin(67.5))*(18cos(67.5)) Area = 648*sin(67.5)*cos(67.5) Area = 229.1
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Solve the equation 9r - 2 = 16 for r.<br> A) 1<br> B) 2<br> C) 4<br> D) 6
yaroslaw [1]
<span>9r - 2 = 16

9r = 16 + 2 

9r = 18

r = 2

Answer : B) 2</span>
6 0
3 years ago
Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it?
QveST [7]
This is an example of the difference of squares.

a^2 - b^2 = (a-b)(a+b)

So to find the product of <span>(9y</span>²<span> – 4x)(9y</span>²<span> + 4x), we use the formula for the difference of squares.

</span>(9y^2 - 4x)(9y^2 + 4x)\\\\=(9y^2)^2 -(4x)^2\\\\=\boxed{\bf{81y^4 - 16x^2}}<span>
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7 0
3 years ago
Mary read 2/5 of a book in 15 minutes. How much of the book can she read per hour? book per hour.​
Yuliya22 [10]

Answer:½((n/2) – ½) – ½ = 10

½(n/2) – ¼ - ½ = 10 (using the distributive property)

¼n – ¼ - ½ = 10 (multiplying to eliminate the parentheses)

¼n – ¾ = 10 (combining like terms)

¼n = 10¾ (adding ¾ to both sides of the equation)

n = 43 (dividing both sides of the equation by ¼)

Step-by-step explanation:

Let’s start by writing Josie’s first step as an expression. Dividing n by 2, then subtracting ½ from

the result would be (n/2) – ½. If we build on this expression with the information in Josie’s

second step, we get ½((n/2) – ½) – ½. Knowing the final result is 10, we can set up the equation

below, and solve for n as follows: hope this helps

8 0
2 years ago
Read 2 more answers
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earnstyle [38]
Sometimes should be the answer
5 0
3 years ago
50/100 in tenth fraction and decimal form
Flura [38]

Answer:

5/10 and .5

Step-by-step explanation:

50/100 is 1/2 so 1/2 is equal to 5/10

5/10 is also 1/2 and 1/2 as a decimal is .5 or 0.5

hope it helps !

7 0
2 years ago
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