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Sveta_85 [38]
4 years ago
5

A circle has an area of 81pi square units. What is the diameter of the circle

Mathematics
2 answers:
Sonja [21]4 years ago
6 0
The diameter of the circle is 18 unit which is A. Hope it help!
Oksanka [162]4 years ago
6 0
Area of circle (Formula) = πr^2 
<span>81π = πr^2 </span>
<span>r^2 = 81 </span>
<span>radius = 9 </span>
<span> 
</span><span>Hope this helps!</span>
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What is the interval notation for x+1&gt;34?
vodka [1.7K]

Explanation:

<u><em>First you subtract by -1 both sides of an equation.</em></u>

<u><em>x+1-1=34-1</em></u>

<u><em>Then, simplify the number.</em></u>

<u><em>34-1=33</em></u>

<u><em>x>33</em></u>

<u><em>Or interval notation 33,∞ </em></u>

<u><em>Final answer: → x>33 and 33,∞</em></u>

<u><em>Hope this helps!</em></u>

<u><em>Thanks!</em></u>

8 0
3 years ago
Posting a screenshot.
Anna71 [15]
Since 6 is positive, it's (x+blank)^2

6/2=3, and (x+3)^2 = x^2+6x+9. We have x^2+6x-2, so we have to add 9 to both sides to get (x+3)^2-2=9, then subtract 9 from both sides to get
(x+3)^2-11=0, or (x+3)^2=11. Square root both sides to get x+3=sqrt(11), and x=sqrt(11)-3, which is approximately 0.32
8 0
3 years ago
12. Ms. Smith keeps eight different cookbooks on a shelf in one of her kitchen cabinets. How many ways can the eight cookbooks b
Ghella [55]

Answer:

The number of ways are 40320.

Step-by-step explanation:

Consider the provided information.

Ms. Smith keeps eight different cookbooks on a shelf in one of her kitchen cabinets.

We need to determine the number of different ways to put eight cookbooks on the shelf.

We need to select 8 cookbooks taking 8 at a time.

So use the permutation formula: ^{n}P_{n}

Substitute n=8 and simplify.

^8P_8=\frac{8!}{(8-8)!}\\8!=40320

Hence, the number of ways are 40320.

6 0
4 years ago
When a number is tripled, the result is 99. Let p represent the number. What is the value of the number?
artcher [175]

Answer:

p equals 33 which is the answer to the problem

6 0
3 years ago
Builtrite has calculated the average cash flow to be $12,000 with a standard deviation of $4,500. What is the probability of a c
UkoKoshka [18]

Answer:

Step-by-step explanation:

Use the normcdf( function on a basic calculator as follows:

normcdf(-1000, 9750, 12000, 4500).  Result:  0.307.  This is the area under the standard normal curve to the left of 9750.

But we want the area  under the standard normal curve to the right of 9750, so we subtract this 0.307 from 1.000, obtaining the desired result:  0.693.  This roughly corresponds with the last of the given possible answers, 69.15%.

4 0
4 years ago
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