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ad-work [718]
3 years ago
13

Please help I’ll give brainliest

Mathematics
1 answer:
Lady_Fox [76]3 years ago
3 0
I think B :(




ubujujiimijiui
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A letter that represents a number
shtirl [24]
That would be a variable, x being one of the most commonly used variables to represent unknown numbers.
7 0
3 years ago
Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence i
mash [69]

Complete Question

A biologist reports a confidence interval of (3.5,4.9) when estimating the mean height (in centimeters) of a sample of seedlings. What is the estimated margin of error and the sample mean?

Answer:

The  margin of error is  E = 0.7

The  sample mean is  \=  x  =  4.2

Step-by-step explanation:

from the question we are told that

   The  upper limit is  k  =  4.9

    The  lower limit is  r = 3.5

Generally the margin of error is mathematically represented as

      E =  \frac{k - r}{ 2}

      E = \frac{ 4.9  -  3.5 }{2}

     E = 0.7

Generally the sample mean is mathematically evaluated as

        \=  x = k  -  E

=>    \= x  =  4.9 - 0.7

=>    \=  x  =  4.2

4 0
3 years ago
A new television set was recently purchased for the common room in a Residence Hall for $428.00 including tax. If the tax rate i
prohojiy [21]

The price of the television set before taxes is $400

<h3>How to find the price of the television set before taxes.?</h3>

The given parameters are:

Price after tax = $428.00

Tax rate = 7%

The price of the television set before taxes is calculated as:

Price after tax = Price before tax * (1 + tax rate)

This gives

$428.00 = Price before tax * (1 + 7%)

Express the percentage as decimal

$428.00 = Price before tax * (1 + 0.07)

Evaluate the sum

$428.00 = Price before tax * (1.07)

Divide both sides by 1.07

Price before tax = $400

Hence, the price of the television set before taxes is $400

Read more about sales tax at:

brainly.com/question/9437038

#SPJ1

5 0
2 years ago
Point M is the midpoint of AB . AM= 3x+3, and AB=8x−6
algol13
AM= Half of AB

or, 3x+3=(8x-6)/2
or, 6x+6=8x-6
or, 2x=12
Therefore,x=6

so,AM=3*6+3=21
3 0
3 years ago
Read 2 more answers
What are the perimeter and area of a rectangle with a length of 20 in and a width of 15 in
Brilliant_brown [7]

Perimeter is 2 times the length plus 2 times the width.

Area is length times width.

Perimeter = (2 x 20) + (2 x 15) = 40 + 30 = 70 inches.

Area = 20 x 15 = 300 square inches.

5 0
3 years ago
Read 2 more answers
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