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3 years ago

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An electrician changes a flat fee plus an hourly rate for a service call. She changes a total of $94 For a 3-hour service call o

n Monday and $130 for a 5-Your service call on Tuesday. how much should she change for 2-hour service call?

2 answers:

AnnyKZ [126]3 years ago

8 0

$56 (might be wrong but thatś what I got)

LenKa [72]3 years ago

4 0

flat rate is $40 + $ 18 per hour

3 hour = $18 x 3 = $54 + flat rate $ 40 = $ 94

5 hour = $ 18 x 5 = $90 + flat rate $ 40 = $130

2 hour = $ 18 x 2 = $ 36 + flat rate $ 40 = $ 76

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Solve by using the quadratic formula: x^2 - 6x + 7 = 0 Please enter any square root values using "sqrt" or the decimal answer ro

olga nikolaevna [1]

Given parameters:

Quadratic expression:

x² - 6x + 7 = 0

Solve using quadratic formula;

x = $\frac{-b +/- \sqrt{b^{2 } - 4ac} }{2a}$

From the equation;

a = 1, b = -6 and c = 7

Input the parameters and solve;

x = $\frac{-(-6) +/- \sqrt{-6^{2 } + 4 x 1 x 7 } }{2 x 1}$

x = $\frac{6 +/- \sqrt{36} +28 }{2}$

x = $\frac{6 +/- \sqrt{64} }{2}$

x = $\frac{6 + 8}{2 }$ or $\frac{6-8}{2}$

x = 7 or -1

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3 years ago

A sample size must be determined for estimating a population mean given that the confidence level is % and the desired margin o

Sauron [17]

Complete Question

The complete question is shown on the first uploaded image

Answer:

a

$n =290$

b

$n =129$

c

The correct option is D

Step-by-step explanation:

From the question we are told that

The margin of error is $E = 0.23$

The largest value is k = 15

The smallest value is u = 7

From the question we are told the confidence level is 95% , hence the level of significance is

$\alpha = (100 - 95 ) \%$

=> $\alpha = 0.05$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.96$

Generally population standard deviation estimate is mathematically represented as

$\sigma = \frac{Range }{4}$

Here the Range is mathematically represented as

$Range = k - u$

=> $Range = 15 - 7$

=> $Range = 8$

=> $\sigma = \frac{8 }{4}$

=> $\sigma = 2$

Generally the sample size is mathematically represented as

$n = [\frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ] ^2$

=> $n = [1.96 * 2 }{0.23} ] ^2$

=> $n =290$

Generally to obtain a conservatively small sample size the population standard deviation estimate becomes

=> $\sigma = \frac{Range }{6}$

=> $\sigma = \frac{8 }{6}$

=> $\sigma =1.333$

Generally the conservatively small sample size is mathematically evaluated as

$n = [\frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ] ^2$

=> $n = [1.96 * 1.333 }{0.23} ] ^2$

=> $n =129$

6 0

3 years ago

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soldi70 [24.7K]

The quotient in polynomial form is C. x² - x ₊ 1.

<h3>What is synthetic division?</h3>

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More about Synthetic division method :

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1 year ago

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Gnoma [55]

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1.Find the smallest multiple (LCM) of both numbers.

2.Rewrite the fractions as equivalent fractions with the LCM as the denominator.

When working with fractions, the LCM is called the least common denominator (LCD)

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3 years ago

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