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3 years ago

What is the value of x? Enter your answer in the box

Mathematics

2 answers:

Ratling [72]3 years ago

8 0

Answer:

Step-by-step explanation:

AfilCa [17]3 years ago

7 0

Answer:

Step-by-step explanation:

Triangles equal up to 180 degrees therefore you do the following to solve this equation. So you have 80 and 55. So you add 80 to 55 and you get 135. Now you subtract 180 by 135 and that equals 45. So x=45. I will write it out as well.

55+80=135

180-135=45

x=45

To check.

80+55+45=180

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Question is -4x + 14 = 54

777dan777 [17]

Answer: x = -10

Step-by-step explanation:

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3 years ago

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In a chemistry class, 12 L of a 12% alcohol solution must be mixed with a 20% solution to get a 14% solution. How many liters of

tigry1 [53]

Let x = liters 20% solution to be added
then

.12(12) + .20x = .14(12+x)
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3 years ago

Trevor sees 8 red birds.He sees 5 more red birds than blue birds. How many blue birds does trevor see?

max2010maxim [7]

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3 years ago

The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. A

vekshin1

Answer:

$15.7-2.58\frac{2.3}{\sqrt{1731}}=15.6$

$15.7+2.58\frac{2.3}{\sqrt{1731}}=15.8$

We are 99% confident that the true mean of electricity comsumption is between (15.6 and 15.8) kWh

Step-by-step explanation:

Information provided

$\bar X= 15.7$ represent the sample mean for the usage of electricity

$\mu$ population mean (variable of interest)

$\sigma= 2.3$ represent the population standard deviation

n=1731 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula if we know the population deviation:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The Confidence level provided is 0.99 or 95%, the value of significance is $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that $z_{\alpha/2}=2.58$