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Olenka [21]
3 years ago
7

In the given ∆ABC, DE || BC. What is the value of x?

Mathematics
1 answer:
suter [353]3 years ago
7 0

Answer:

I think B is the correct answer, sorry im not very good with math tho.

Step-by-step explanation:

Sorry if its incorrect

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Please help.<br><br>Solve for x <br><br>​
Andreas93 [3]

Answer:

b i just dat.

Step-by-step explanation:

8 0
3 years ago
The area of the triangle is 42 square inches. find the value of x when a = x and b = (x+8)
damaskus [11]

Answer:

6 and -14

Step-by-step explanation:

Area of the triangle = 1/2 ab

42 = 1/2 (x)(x+8)

42 *2 = x(x+8)

84 = x²+8x

x²+8x-84 = 0

x²+14x-6x-84 = 0

x(x+14)-6(x+14) = 0

x-6 = 0 and x+14 = 0

x = 6 and -14

Hence the values of x are 6 and -14

3 0
2 years ago
I'm not good at graph math, please help if you can. Thank you<br> Its not C
viktelen [127]

Answer:

D

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
What would be the steps in solving 2b + 3b = 3?
sweet-ann [11.9K]

The answer is b=\frac{3}{5}.

Let's solve your equation step-by-step.

2b+3b=3

Step 1: Simplify both sides of the equation.

2b+3b=3

(2b+3b)=3(Combine Like Terms)

5b=3

5b=3

Step 2: Divide both sides by 5.

5b/5=3/5

So, the answer is b=\frac{3}{5}.

4 0
3 years ago
A survey is to be conducted to determine the average driving in miles by Minnesota State University, Mankato students. The inves
Nadusha1986 [10]

Answer:

n=(\frac{1.75(8.2)}{1.5})^2 =91.52 \approx 92

So the answer for this case would be n=92 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)

s represent the sample 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 =1.5 and we are interested in order to find the value of n, if we solve n from equation (b) we got:

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

The critical value for 92% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.04;0;1)", and we got z_{\alpha/2}=1.75, replacing into formula (b) we got:

n=(\frac{1.75(8.2)}{1.5})^2 =91.52 \approx 92

So the answer for this case would be n=92 rounded up to the nearest integer

5 0
3 years ago
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