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Inessa [10]
4 years ago
8

Can u guys PLEASE answer this question ASAP. THIS IS EXTREMELY URGENT. Twenty circular pieces of pastry, each of diameter 4 cm,

are cut from a rectangular layer of pastry 20 cm long and 16 cm wide. What is the area, correct to two decimal places, of pastry remaining after the 20 pieces are removed?
Mathematics
1 answer:
Anettt [7]4 years ago
5 0

Answer:

68,67 cm^2

Step-by-step explanation:

Let's calculate first the total area of pastry that we have.

Let A be that area.

The pastry has rectangular form so its area is:

● A = width × length

The width here is 16 and the length is 20

● A = 20 × 16

● A = 320 cm^2

■■■■■■■■■■■■■■■■■■■■■■■■■■

Let's calculate the are of the 20 pastry circles

Let A' be the area of one circle.

● A' = Pi × r^2

r is the radius wich is the diameter over 2.

● d/2 = 4/2 = 2 cm

● A' = Pi × 2^2

● A' = 4Pi cm^2

The area of 20 pastry circles is 20A'

● 20A'= 20 × 4 × Pi

● 20A'= 80Pi

■■■■■■■■■■■■■■■■■■■■■■■■■■

Let A" be the area of the remaining pastry

● A" = A-20A'

● A" = 320 - 80Pi

● A" = 68.67 cm^2

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R-5h=Hr+2h solve for r
VikaD [51]

Answer:

The solution to this equation could not be determined.

Step-by-step explanation:

Simplifying

r + -5h = hr + 2h

Reorder the terms:

-5h + r = hr + 2h

Reorder the terms:

-5h + r = 2h + hr

Solving

-5h + r = 2h + hr

Solving for variable 'h'.

Move all terms containing h to the left, all other terms to the right.

Add '-2h' to each side of the equation.

-5h + -2h + r = 2h + -2h + hr

Combine like terms: -5h + -2h = -7h

-7h + r = 2h + -2h + hr

Combine like terms: 2h + -2h = 0

-7h + r = 0 + hr

-7h + r = hr

Add '-1hr' to each side of the equation.

-7h + -1hr + r = hr + -1hr

Combine like terms: hr + -1hr = 0

-7h + -1hr + r = 0

Add '-1r' to each side of the equation.

-7h + -1hr + r + -1r = 0 + -1r

Combine like terms: r + -1r = 0

-7h + -1hr + 0 = 0 + -1r

-7h + -1hr = 0 + -1r

Remove the zero:

-7h + -1hr = -1r

Combine like terms: -1r + r = 0

-7h + -1hr + r = 0

The solution to this equation could not be determined.

6 0
3 years ago
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When using base-10 blocks to divide 452 by 2, how many hundreds flats will be in each equal group? hundreds flats Divide 452 by
daser333 [38]
<h3>Given</h3>

4 hundreds flats; 5 tens rods; 2 ones cubes

<h3>Find</h3>

The number of hundreds flats in each of 2 equal piles

<h3>Solution</h3>

When 4 flats are divided into two equal groups, each group will have ...

... 2 flats

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You can imagine doing this the way a card dealer might: first put 1 flat in each of 2 piles, then do the same for the remaining 2 flats. Each pile will end up with 2 flats.

— — — — —

You will have a problem if you continue with the tens rods. There is an odd number of those, so one of them will have to be exchanged for 10 ones cubes.

8 0
3 years ago
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Dahasolnce [82]

Answer:

A

Step-by-step explanation:

if X is 7, and is connected/touching the three. You have to multiply and 7×3=21

6 0
4 years ago
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alisha [4.7K]

Answer:

4??? lol

Step-by-step explanation:

5 0
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Margarita [4]

Answer:

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Step-by-step explanation:

median: The middle number after the numbers have been sorted into ascending or descending order.

Mean: The quotient of the numbers added together then divided by the amount of numbers.

So if 9 were the missing number the median would be 5 because in ascending order it would look like this:

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The mean would also be 5 because

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and 25 divided by 5 equals 5

So therefore the missing number must be 9.

(Also it was obvious that they just added 2 to each number)

4 0
2 years ago
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