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svetlana [45]
4 years ago
15

What is the principal square root of 81?

Mathematics
2 answers:
Bumek [7]4 years ago
6 0
The square foot of 81 is 9
ch4aika [34]4 years ago
5 0

Answer:

9

Step-by-step explanation:

9*9 = 81

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I would appreciate I someone could help me with these questions
svet-max [94.6K]
38: it's a right triangle
39:
area:
a = \pi {r}^{2}
a = 3.14 \times {10}^{2} = 314

circumference:
c = \pi \times diameter
c = 3.14 \times 20 = 62.8
8 0
3 years ago
4x-5=19 please help thank you
frosja888 [35]

Answer:

x=6

Step-by-step explanation:

4x - 5 = 19

4x = 19 + 5

4x = 24

x =  \frac{24}{4}

x = 6

4 0
2 years ago
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The two perpendicular number lines that are used for graphing are called
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The x-axis (horizontal) and the y-axis (vertical).
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4 years ago
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Which of the following triangles is a scalene triangle?
mixer [17]

the answer is D 6 8 10 is a scalene triangle

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3 years ago
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Suppose 10000 people are given a medical test for a disease. About1% of all people have this condition. The test results have a
Alina [70]

Answer:

The percent of the people who tested positive actually have the disease is 38.64%.

Step-by-step explanation:

Denote the events as follows:

<em>X</em> = a person has the disease

<em>P</em> = the test result is positive

<em>N</em> = the test result is negative

Given:

P(X)=0.01\\P(P|X^{c})=0.15\\P(N|X)=0.10

Compute the value of P (P|X) as follows:

P(P|X)=1-P(P|X^{c})=1-0.15=0.85

Compute the probability of a positive test result as follows:

P(P)=P(P|X)P(X)+P(P|X^{c})P(X^{c})\\=(0.85\times0.10)+(0.15\times0.90)\\=0.22

Compute the probability of a person having the disease given that he/she was tested positive as follows:

P(X|P)=\frac{P(P|X)P(X)}{P(P)}=\frac{0.85\times0.10}{0.22} =0.3864

The percentage of people having the disease given that he/she was tested positive is, 0.3864 × 100 = 38.64%.

3 0
3 years ago
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