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3 years ago

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What is the area of a regular 15-gon with a perimeter of 90 m ?

1 answer:

7nadin3 [17]3 years ago

8 0

We are given with a regular 15-gon with a perimeter of 90 meters. In this case, side length is equal to 90/15 or 6 m. The angle inside the center is 360/15 or 24 degrees. We determine the area of each triangle (15 of them) and just multiply by 15 to get the total area. The height of each triangle is tan (12) = 3/ h where h is equal to 14.11 meters. Hence the area is 0.5*14.11*6*15 or equal to 635.13 meters.

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Simplify the difference. (–7x – 5x^4 + 5) – (–7x^4 – 5 – 9x)

sineoko [7]

Answer: $2x^4+2x+10$

Step-by-step explanation:

You need to remember the mulplication of signs:

$(+)(+)=+\\(-)(-)=+\\(-)(+)=-$

Knowing this, you can distributive the negative sign. Then you get:

$(-7x- 5x^4 + 5) - (-7x^4 - 5 - 9x)=-7x- 5x^4 + 5 +7x^4 + 5 + 9x$

Now you need to add the like terms. Then:

$=2x+2x^4+10$

Finally, you can order the polynomial obtained in descending order. Therefore, the answer is:

$=2x^4+2x+10$

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3 years ago

Samuel wants to use his earnings from Monday and Tuesday to buy some batteries

IrinaK [193]

Answer: There are 2 batteries which he can buy with his earnings .

Step-by-step explanation:

Since we have given that

Selling price of cans at the recycling center = $0.40 per pound

Number of pounds of cans he sold on Monday = 16.2

Number of pounds of cans he sold on Tuesday = 11.8

Total earning of Samuel is given by

$(16.2+11.8)\times 0.40=\$11.2$

Now, cost of battery =$5.60

So, number of batteries he can buy is given by

$\frac{\text{ Total earnings}}{\text{ Cost of each battery}}\\\\=\frac{11.2}{5.6}\\\\=2$

So, there are 2 batteries which he can buy with his earnings .

4 0

3 years ago

Read 2 more answers

Which quantity is proportional to 90⁄2

hoa [83]

Answer:

Step-by-step explanation:

90/2 is proportional to 45

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4 years ago

What is 5.75% of $6,000? (Express answer as dollars as cents.)

Len [333]

6000*0.0575=345
Final answer: $345.00

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3 years ago

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Plenty of points + Brainiest.....Please help me

balu736 [363]

Answer:

Part A.) i would say nickel and copper

Part B.) 1,034.8

Step-by-step explanation:

A.) i would say copper and nickle because they are closest in value

B.) to find the average you add all the numbers then divide them by the amount of numbers:

For example if you have 1, 3, 5 & 8

you would add 1 + 3 + 5 + 8 which equals 17

then you divide 17 by 4 which equals 4.25

Hope This Helps!!

4 0

3 years ago

Read 2 more answers