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3 years ago

I Need help with this question.

Mathematics

1 answer:

loris [4]3 years ago

6 0

Answer:

Step-by-step explanation:

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I hope someone knows.

pochemuha

Answer:

x = 9

Step-by-step explanation:

This is a 45-45-90 right triangle so the sides are in the ratio x: x: $x\sqrt{2}$

8 0

3 years ago

The battery standby duration (in hours) of a new model of cell phone is known to be normally distributed. Ten pieces of such new

kap26 [50]

Answer:

$\mu = 47.17$

$\sigma = 2.31$

Step-by-step explanation:

Solving (a): The population mean

This is calculated as:

$\mu = \frac{\sum x}{n}$

So, we have:

$\mu = \frac{48.2+ 47.8 +45.6 +47.2 +49.3+51.2 +44.2 +45.4 +49.2 +43.6}{10}$

$\mu = \frac{471.7}{10}$

$\mu = 47.17$

Solving (b): The population standard deviation

This is calculated as:

$\sigma = \sqrt{\frac{\sum (x - \mu)^2}{n}}$

So, we have:

$\sigma = \sqrt{\frac{(48.2-47.17)^2 + (47.8-47.17)^2 +.........+(43.6-47.17)^2}{10}}$

$\sigma = \sqrt{\frac{53.521}{10}}$

$\sigma = \sqrt{5.3521$

$\sigma = 2.31$

4 0

3 years ago

Step 1 -3(3x+5)-6<6

Mnenie [13.5K]

Error is between steps 4 and 5. It should say:

Step 4: -9x < 27
Now divide by -9
Step 5: x > -3
Note that the inequality changes direction.
When you mean multiply or divide an inequality by a negative number, the inequality changes direction.

For example:
4 < 5
Multiply by -1:
-4 > -5

Another example:
-5 < 0
5 > 0

6 0

3 years ago

Classify the shape as precisely as possible based on its markings. Question 18 options: A) Square B) Quadrilateral C) Parallelog

Arisa [49]

Answer:

parallelogram

Step-by-step explanation:

technically its a quadrilateral too but seeing as it has 2 sets of parallel lines Im going with parallelogram.

5 0

3 years ago

Read 2 more answers

Which of the following has the smallest probability?

Alborosie

Answer:

The answer is a and d

Step-by-step explanation:

3 0

3 years ago