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lara31 [8.8K]
2 years ago
5

Should you add or subtract these equations? `2x+y=12` x+y=10helppp

Mathematics
2 answers:
dexar [7]2 years ago
8 0

Answer:

i would add

Step-by-step explanation:

Blizzard [7]2 years ago
5 0

Answer:

I would subtract.

Step-by-step explanation:

You need to do the opposite of what the sign says when doing equations.

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3/12+ = 7/12 as a faction <br><br> please help me
ohaa [14]

Answer:

10/12 or simplified its 5/6

Step-by-step explanation:

3+7 = 10

you keep the 12

10÷2 = 5

12÷2=6

common denominator

6 0
3 years ago
The proprietor of a boutique in New York wanted to determine the average age of his customers. A random sample of 25 customers r
jolli1 [7]

Answer:

28-2.064\frac{10}{\sqrt{25}}=23.872    

28+2.064\frac{10}{\sqrt{25}}=32.128    

So on this case the 95% confidence interval would be given by (23.9;32.1)  

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=28 represent the sample mean

\mu population mean (variable of interest)

s=10 represent the sample standard deviation

n=25 represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=25-1=24

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,24)".And we see that t_{\alpha/2}=2.064

Now we have everything in order to replace into formula (1):

28-2.064\frac{10}{\sqrt{25}}=23.872    

28+2.064\frac{10}{\sqrt{25}}=32.128    

So on this case the 95% confidence interval would be given by (23.9;32.1)    

7 0
3 years ago
PLEASE SOMEONE HELP ME!!! I WILL GIVE BRAINLIEST TO CORRECT ANSWER!!! PLSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
taurus [48]
8.8 squared + 9.5 squared = square root 12.94 rounded 12.1
3 0
3 years ago
A volcano on a recently discovered planet rises to a height of 16.871 mi.
Vinvika [58]
The answer is 89078.88 ft

1 mile = 5280 feet

Multiply 16.871 by the length value of 5280

16.871 * 5280 = 89078.88 ft
5 0
2 years ago
Solve√( 7×±4 )≈2√× and the steps involved
Neporo4naja [7]
Hey it Tya!

Hey ur welcome !

Hahah
4 0
3 years ago
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