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3 years ago

Please help this is due at 11:59 and im really stuck.

Mathematics

2 answers:

natima [27]3 years ago

8 0

Has form - last two
can be put in form - none
other - first four

mel-nik [20]3 years ago

5 0

9514 1404 393

Answer:

B B C C A A

Step-by-step explanation:

If we number the equations 1 to 6 left to right, then we have ...

B - can be put (y = 2x)
B - can be put (y = (1/9)x)
C - other, not a proportional relationship
C - other, y = 5/x, an inversely proportional relationship
A - has the form, k = 0.04
A - has the form, k = -11

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Solve for r.<br><br> 7r + 7= 2r − 3<br><br> Enter your answer in the box

leonid [27]

The answer if we go by solving only for "r" Will be -2, in other words r=-2

3 0

3 years ago

Need help, please explain the answer

Mkey [24]

Answer:

Step-by-step explanation:

U have to multiply 49 by 49 and then subtract 9

4 0

3 years ago

A local marketing company wants to estimate the proportion of consumers in the Oconee County area who would react favorably to a

Burka [1]

Answer:

C. n=423

Step-by-step explanation:

1) Notation and important concepts

Margin of error for a proportion is defined as "percentage points your results will differ from the real population value"

Confidence=90%=0.9

$\alpha=1-0.9=0.1$ represent the significance level defined as "a measure of the strength of the evidence that must be present in your sample before you will reject the null hypothesis and conclude that the effect is statistically significant".

$\hat p=0.5$ represent the sample proportion of consumers in the Oconee County area who would react favorably to a marketing campaig. For this case since we don't have enough info we use the value of 0.5 since is equiprobable the event analyzed.

$z_{\alpha/2}$ represent a quantile of the normal standard distribution that accumulates ${\alpha/2}$ on each tail of the distribution.

2) Formulas and solution for the problem

For this case the margin of error for a proportion is given by this formula

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

For this case the confidence level is 90% or 0.9 so then the significance would be

$\alpha=1-0.9=0.1$ and $\alpha/2=0.05$

With $\alpha/2=0.05$ , we can find the value for $z_{\alpha/2}$ using the normal standard distribution table or excel.

The calculated value is $z_{\alpha/2}=1.644854$

Now from equation (1) we need to solve for n in order to answer the question.

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

Squaring both sides:

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

And solving for n we got:

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

Now we can replpace the values

$n=\frac{0.5(1-0.5)}{(\frac{0.04}{1.644854})^2}=422.739$

And rounded up to the nearest integer we got:

n=423

3 0

3 years ago

Solve the following equation: |-3x+3|-9=12

photoshop1234 [79]

Answer:

$\large\boxed{\left \{ {{x\: = \: 8} \atop {x\: =\: -6}} \right. }\\$

Step-by-step explanation:

$\left| -3x+3 \right| -9=12$

At first, let's add - 9 to both the sides. So,

$\left| -3x+3 \right| -9=12\\|-3x+3|=21$

Now, using the definition of absolute value, we can change the equation to..

$-3x+3=21 \\-3x+3=-21$

By, subtracting 3 from both the sides,

$-3x=18 \\-3x=-24$

Now, divide both the sides by 6,

$x=-6 \\x=8$

We now have 2 values of x. They are...

$\large\boxed{\left \{ {{x\: = \: 8} \atop {x\: =\: -6}} \right. }\\$

____________

Hope it helps!

$\mathfrak{Lucazz}$

5 0

2 years ago

What line has slope of 5/8 and goes through the point (2,-3)

sweet-ann [11.9K]

Slope of a line passing through a point is given by: y - y1 = m(x - x1); where (x1, y1) = (2, -3) and m = 5/8.
Therefore equation of the line is y - (-3) = 5/8(x - 2)
8(y + 3) = 5x - 10
8y + 24 = 5x - 10
8y - 5x = -10 - 24 = -34
5x - 8y = 34

7 0

3 years ago