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3 years ago

Please help brainliest and 20 points!

Mathematics

1 answer:

Nadya [2.5K]3 years ago

4 0

Answer:

I'm so sorry I can't help haven't learned how to do that yet

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The courtyard outside East Middle School is in the shape of a rectangle and half-circle.

Nadya [2.5K]

Answer:

The correct option is the third one counting from the top. (5892 m^2)

Step-by-step explanation:

First, we need to remember that:

For a rectangle of length L and width W, the area is:

A = L*W

For a circle of diameter D, the area is:

A = pi*(D/2)^2

Where pi = 3.14

In the image, we can see a rectangle and half a circle, the total area of the image will be equal to the area of the rectangle plus the area of the half circle.

In the image, we can see a rectangle of length L = 100m and width W = 50m

Then the area of the rectangle is:

A = 100m*50m = 5000m^2

And we can see that for the half-circle the diameter is D = 50m

Note that the area of a half-circle is half of the area of a complete circle, then the area of that half-circle is:

A = (1/2)*(3.14*(50m/2)^2) = 981.25 m^2

If we add these two areas we get:

Total area = 5000m^2 + 981.25 m^2 = 5981.25 m^2

If we round it up, we get:

Total area = 5982 m^2

The correct option is the third one counting from the top.

8 0

2 years ago

The life of a manufacturer's compact fluorescent light bulbs is normal, with mean 12,000 hours and standard deviation 2,000 hour

ikadub [295]

Mean = 12000
Standard Deviation = 2000

We have to find how many standard deviations is 14,500 away from the mean.
This can be achieved by calculating the z-score

Z-score tells us how many standard deviations above or below is a sample value from the mean. A positive z value shows, sample value is above the mean.

z score can be calculated as = (Sample Value - Mean )/Standard Deviation)
So,
Z-score = $\frac{14500-12000}{2000} =1.25$

This means, 14,500 is 1.25 standard deviations above the mean value 12,000.

4 0

2 years ago

Read 2 more answers

Ernie Rolph deposits $4500 at 2% annual simple interest for 1 year. How much interest will he earn?

vaieri [72.5K]

Answer: the amount of interest that he would earn is $90.

Step-by-step explanation:

The formula for determining simple interest is expressed as

I = PRT/100

Where

I represents interest paid on the amount of money deposited.

P represents the principal or amount of money deposited.

R represents interest rate on the deposit.

T represents the duration of the deposit in years.

From the information given,

P = $4500

R = 2%

T = 1 year

Therefore,

I = (4500 × 2 × 1)/100

I = $90

8 0

2 years ago

Need help , use pics ^

Rashid [163]

Answer:

Step-by-step explanation:

Are there any other pictures of the actual problem?

This is proabbaly a transformation problem

8 0

2 years ago

Help help help help help help help!!!!!!!

Strike441 [17]

Answer:

-65/24

Step-by-step explanation:

-26/8 * 5/6 .To divide by a fraction, multiply bhy the reciprocal of that fraction. -13/4 * 5/6. Reduce the fraction with two. multiply -13/4*5/6 and you get -65/24

3 0

3 years ago

Read 2 more answers