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postnew [5]
3 years ago
9

Khan academyyyy ⠀⠀⠀⠀⠀⠀⠀⠀

Mathematics
2 answers:
Shalnov [3]3 years ago
8 0

Answer:

A

C

E

Step-by-step explanation:

-4 + (4 + 5)

Using BEDMAS

Brackets

Exponents

Division

Multiplication

Addition

Subtraction

solve brackets first...

(4 + 5) = 9

9 - 4 = 5

A) (-4+4) + 5

   = (0) + 5

   = 5

B) (-4 - 4) + 5

   =(-8) + 5

   = - 3

C) -( 4 - 4) + 5

   = -(0) + 5

   = 5

D) - (4)+ ( -4) + 5

   = -4 + -4 + 5

   = -8 + 5

   = -3

E) -4 + 4 + 5

  =  0 + 5

  = 5

matrenka [14]3 years ago
5 0

Answer:

option A, C , E

Step-by-step explanation:

- 4 + ( 4 + 5 ) = ( - 4 + 4 ) + 5      [ associative property ]

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Lucy makes green paint by mixing yellow and blue paint in the ratio 5:2. Blue paint costs
ahrayia [7]

Answer:

No, she won’t make a profit

Step-by-step explanation:

Here, we are interested in determining if Lucy made a profit or a loss.

The cost of blue paint is 30 pounds for 5 liters. This means that a liter of blue paint is 30/5 = 6 pounds per liter

The cost of yellow paint is 28 pounds per 7 liters, the cost per liter is 28/7 = 4 pounds per liter

Now, in her mixing, she mixes 5 parts of yellow paint and 2 parts of blue paint.

This means that she mixed them the ratio as follows per liter;

For yellow, we have; 5/(5+2) = 5/7

For blue we have 2/(5+2) = 2/7

Now since a liter of yellow paint cost 4 pounds

5/7 of a liter will cost 5/7 * 4 = 20/7 pounds

For the blue paint, a liter cost 6 pounds, 2/7 of a liter will cost 2/7 * 6 = 12/7

The total cost in pounds in this;

20/7 + 12/7 = 32/7 = £4.57 pounds to 2 decimal place

Now she sells her green paint product at £4.5 per liter. Since this is less than the cost price of production which is £4.57, she is running at a loss

8 0
3 years ago
250 grams of sugar cost 150 dollars at Shop X. 100 grams of sugar cost 95 dollars at Shop Y. What is the difference in cost per
nata0808 [166]
<h2>Answer:</h2>

350 dollars

<h2>Step-by-step explanation:</h2>

<em>(step 1) Find the cost per kilogramme of sugar in shop X</em>

In shop X:

250 grams of sugar costs 150 dollars.

<em>Remember that;</em>

1000 grams = 1 kilogramme.

=> 250 grams will be equal to 0.25 kilogramme

Therefore (replacing 250 grams with 0.25 kilogramme) in shop X;

0.25 kilogramme of sugar costs 150 dollars

Now, if

0.25 kilogramme = 150 dollars,

=> 1 kilogramme =  150 dollars x 1 kilogramme / 0.25 kilogramme

=> 1 kilogramme = 600 dollars

Therefore, the cost per kilogramme of sugar in shop X is 600 dollars

<em>(step 2) Find the cost per kilogramme of sugar in shop Y</em>

In shop Y:

100 grams of sugar costs 95 dollars.

<em>Remember that;</em>

1000 grams = 1 kilogramme.

=> 100 grams will be equal to 0.1 kilogramme

Therefore (replacing 100 grams with 0.1 kilogramme) in shop Y;

0.1 kilogramme of sugar costs 95 dollars

Now, if

0.1 kilogramme = 95 dollars,

=> 1 kilogramme =  95 dollars x 1 kilogramme / 0.1 kilogramme

=> 1 kilogramme = 950 dollars

Therefore, the cost per kilogramme of sugar in shop Y is 950 dollars

<em>(step 3) Find the difference in cost per kilogramme of sugar between the two shops</em>

The difference is calculated by subtracting the cost per kilogramme of sugar in shop X from the cost per kilogramme of sugar in shop Y. i.e

=> cost per kilogramme of sugar in shop Y - cost per kilogramme of sugar in shop X

=> 950 dollars - 600 dollars

=> 350 dollars.

Therefore, the difference in cost per kilogramme is 350 dollars

3 0
3 years ago
Please do answer: <br><br>Simplify the expression---5x-2y + 3x + 2y<br><br>(100 points)
netineya [11]
  • 5x-2y+3x+2y

Combine like terms

  • 5x+3x-2y+2y
  • (5+3)x+(-2+2)y
  • 8x+0
  • 8x
8 0
2 years ago
Read 2 more answers
HELP MATH QUESTION GEOMETRY
schepotkina [342]

Angle COD equals angle AJL

Angle DCO equals Angle LAJ

Side OC equals side JA is all true expect for the first one

3 0
3 years ago
7/8, 3/10 whats the common denominator
Ivahew [28]
The common denominator is 40.

3 0
3 years ago
Read 2 more answers
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