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larisa [96]
3 years ago
15

PLZZZ help me!!!!

Mathematics
1 answer:
weqwewe [10]3 years ago
7 0

y=-3x+4

x=2y+6

y + 3x =4

-2 + =6

x= 2y +6

y+3.(2y+6)=4

7y = -14

7y=-14

y=-2

y=-2

x=2y+6

x=2(-2)+6=2

solution is {y,x}= {-2,2}

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8x-5y= 14<br> – 5х+бу = -3
podryga [215]

Answer:

y= 34/23

x=  123/46

Step-by-step explanation:

Solve for x

8x-5y= 14

x= 14/8 +5/8y

Sub x into second equation

– 5х+бу = -3

-5(14/8 +5/8y) + 6y= -3

-29/4 +23/8y = -3

y= 34/23

Sub y into any equation and solve for x

8x=483/23

x= 123/46

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3 years ago
3 to the third power minus 2 times 3 plus 5
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Answer: 26

<u>Step 1</u>

27-(2)(3)+5

<u>Step 2</u>

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<u></u>21+5<u></u>

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5 0
3 years ago
Mario has a remaining balance of $1,300 on his credit card his credit card has an APR of 20% how much will he pay in interest in
nydimaria [60]
The correct answer for this problem is 6,500 in one month
4 0
2 years ago
A table showing Number, Value, and Total Value. The first row shows Pennies, with the entries, p, 0.01, and 0.01 p. The second r
Romashka [77]

Answer:

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Step-by-step explanation:

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6 0
2 years ago
Read 2 more answers
A fast food restaurant executive wishes to know how many fast food meals adults eat each week. They want to construct a 98% conf
adelina 88 [10]

Answer:

n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337

So the answer for this case would be n=1337 rounded up to the nearest integer

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 represent the sample mean for the sample  

\mu population mean (variable of interest)

\sigma=1.1 represent the population standard deviation

n represent the sample size  

Solution to the problem

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =0.07 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

The critical value for 98% of confidence interval now can be founded using the normal distribution. And in excel we can use this formula to find it:"=-NORM.INV(0.01;0;1)", and we got z_{\alpha/2}=2.326, replacing into formula (b) we got:

n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337

So the answer for this case would be n=1337 rounded up to the nearest integer

3 0
3 years ago
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