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3 years ago

−3x+4y=14

Mathematics

1 answer:

ZanzabumX [31]3 years ago

5 0

Neither only 7×2=14 4,6 is not = to 14 neither

2,5

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help it is due today and not links or files of downloads of anything like that just type in your answer plz and thank u :)

pantera1 [17]

The answer should be x=4

4 0

3 years ago

Read 2 more answers

The square of a number x is 92. The number x is between what two consecutive whole numbers?

natta225 [31]

The number X is placed somewhere between 9 and 10. That's because 9 squared is 81 and 10 squared is 100.

5 0

3 years ago

Sombody is taking a 1680 mile road trip. At the end of the first day they had completed 3/8of there trip. How many miles did the

patriot [66]

Answer:

Step-by-step explanation:

1680 mile road trip....they completed 3/8 of it...

so we need to figure 3/8 of 1680

" of " in math language means multiply

3/8 * 1680 = 5040/8 = 630 miles <===

7 0

3 years ago

When the sample size and the sample proportion remain the same, a 90 percent confidence interval for a population proportion p w

deff fn [24]

Answer:

A 90% confidence interval for p will be narrower than the 99% confidence interval.

Step-by-step explanation:

The formula to compute the (1 - α) % confidence interval for a population proportion is:

$CI=\hat p\pm z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

Here $\hat p$ is the sample proportion.

The margin of error of the confidence interval is:

$MOE= z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

The MOE is dependent on:

Confidence level
Standard deviation
Sample size

The MOE is directly related to the confidence level and standard deviation.

So if any of the two increases then the MOE also increases, thus widening the confidence interval.

And the MOE is inversely related to the sample size.

So if the sample increases the MOE decreases and vice versa.

It is provided that the sample size and the sample proportion are not altered.

The critical value of z for 90% confidence level is:

$z_{\alpha/2}= z_{0.10/2}=z_{0.05}=1.645$

And the critical value of z for 99% confidence level is:

$z_{\alpha/2}= z_{0.05/2}=z_{0.05}=1.96$

So as the confidence level increases the critical value increases.

Thus, a 90% confidence interval for p will be narrower than the 99% confidence interval.

6 0

2 years ago

Solve the system of equations by using substitution. y = 2x +3 y = -x + 6

padilas [110]

Answer:

x =3, y =3

Step-by-step explanation:

From the second equation( y= -x+6) we can get x alone.

Subtracting 6 from both sides we get, y-6 = -x

And then dividing both sides by -1, -y+6 = x

Then we can substitute this value of x into the first equation.

y = 2(-y+6) +3

Simplifying,

y = -2y + 12+ 3

3y = 15

y = 3

Substituting this back into second equation we get 3 = -x + 6

and -x = -3

Dividing both sides by -1,

we get x =3

4 0

3 years ago