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2 years ago

Please help me, I’ll give brainliest

Mathematics

1 answer:

kolbaska11 [484]2 years ago

7 0

Answer:

x = 45

y = 5

Step-by-step explanation:

it is because

90/2 = 45

(90+10)/20 

(100)/20 = ,5

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What is the degree of EMD and what is the degree for DMB

elena55 [62]

EMD = 90 - DMC
EMD = 90 - 20
EMD = 70

Now, DMB = 180 - FMD
DMB = 180 - 90
DMB = 90

Hope this helps!

8 0

2 years ago

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insens350 [35]

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2 years ago

Jodie bought a music player on sale for 50% off the original price, for $60. What was the price of the music player before the s

Marta_Voda [28]

Answer:

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Step-by-step explanation:

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3 0

2 years ago

Which equation applies the associative property of multiplication?

beks73 [17]

associative property of multiplication?
answer
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6 0

2 years ago

Suppose we want a 90% confidence interval for the average amount spent on entertainment (movies, concerts, dates, etc.) by fresh

katovenus [111]

Answer:

609

Step-by-step explanation:

Standard deviation = $\sigma$ = $30

Margin of error = E = $2

Confidence level = 90%

Since the distribution is said to be normal, we will use z scores to solve this problem.

The z score for 90% confidence level = z = 1.645

Sample size= n = ?

The formula to calculate the margin of error is:

$E=z\frac{\sigma}{\sqrt{n}}\\\\\sqrt{n}=z\frac{\sigma}{E}\\\\n=(\frac{z\sigma}{E} )^{2}$

Using the values in above equation, we get:

$n=(\frac{1.645 \times 30}{2} )^{2}\\\\ n = 608.9$

This means, the minimum number of observations required is 609

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2 years ago