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yKpoI14uk [10]
3 years ago
7

According to a study, 91% of all adults have a cell phone. An employee of a cell phone company attends a community event and has

a special offer to give to first time cell phone owners. If she randomly selects adults in attendance at the event and cell phone ownership is independent from adult to adult, what is the probability that she asks 21 adults total to find the first one that does not own a cell phone?
Mathematics
1 answer:
umka2103 [35]3 years ago
6 0

Answer:

(0.91)^{20}(0.09)

Step-by-step explanation:

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Five more than a number is three
Pavel [41]

I'm not sure if you use "x" as your variable, so:

# + 5 = 3 or x + 5 = 3

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3 years ago
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find the equation of the straight line which has a gradient of 3 and passes through the point (-1, 3)
iogann1982 [59]

Answer:

y=3x+6

Step-by-step explanation: 3=3(-1)+b

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                                             +3  +3

                                              6=b

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2 years ago
If you reflect triangle MOV across the x-axis, what is the coordinate of O in the image?
Zina [86]

Hi,

The answer you are looking for is 2. (-4,2)

Have a great day & remember to mark brainliest if I helped :)

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3 years ago
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Which equation is equivalent to StartRoot x squared + 81 EndRoot = x + 10?
marishachu [46]

The given equation is equivalent to Option D .

The mission option is

A. x+10= x+10

B. x+9 =x² + 20x + 100

C. x² +81 = x² + 100

D. x² + 81 = x² +20x + 100

<h3>What is an Equation ?</h3>

An equation is a mathematical statement formed when two algebraic expression is equated by an equal sign .

An equation is given in the question

\rm \sqrt{x^2 + 81} = x +10

\rm {x^2 + 9^2} = (x +10)^2

\rm {x^2 + 81} = x^2 +20x + 100

Therefore the given equation is equivalent to Option D .

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brainly.com/question/10413253

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5 0
2 years ago
Bobby read a total of 20 books over 2 months. If Bobby has read 90 books so far, how many months has he been with his book club?
tatuchka [14]

Step 1

From the question;

\begin{gathered} Bobby\text{ reads 20 books in 2 months} \\  \end{gathered}

We are required to find how many months it will take him to read 90 books

Step 2

We will use the ratio below to solve the problem.

\begin{gathered} \frac{20\text{ books}}{90\text{ books}}=\frac{2months}{x} \\ x=months\text{ to read 90books} \\ x=\frac{90\times2}{20} \\ x=9\text{ months} \end{gathered}

Answer; It will take Bobby 9months to read 90 booj

9\text{ months}

8 0
1 year ago
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