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Karolina [17]
3 years ago
15

Does the commutative property of addition apply when you add two negative integers

Mathematics
1 answer:
Levart [38]3 years ago
8 0
Yes the commutative property of addition.
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How do you find the surface area for this shape?
fgiga [73]

Answer:

  • total area is the total of the areas of each of the rectangular surfaces
  • 67 units²

Step-by-step explanation:

Add up the surface areas of each of the 6 faces.

There are two top/bottom faces with the same area, two left/right faces with the same area, and two front/back faces with the same area. So you only need to figure the areas for 3 faces, then multiply that sum by 2. Of course the area of each rectangle is the product of its length and width. For length, width, and height dimensions L, W, and H, the total area is ...

A = 2(LW +WH +LH)

  = 2(LW +H(L+W)) . . . . . I like this form because there's one less multiplication

  = 2(5·4 + 1.5(5+4)) = 2(20 +13.5)

A = 67 . . . units²

_____

<em>Comment on dimensions</em>

It does not matter which number you use for length, width, or height. The problem is symmetrical that way, so any of the dimensions can be called any of those things. You need to use the same number consistently for height (for example) once you have made the choice of which is which.

3 0
3 years ago
The sum of two numbers is 21.
Delvig [45]

Answer:

3 and 18

Step-by-step explanation:

let x be the first number

let 6x be the second number

x + 6x = 21

7x=21

x=21/7

x=3

second number =6x

second number 6x3= 21

5 0
3 years ago
Are the two triangles below similar??
kodGreya [7K]

Answer:

Yes

Step-by-step explanation:

If you find the value of all the angles, you'll find that both triangles' angles are 50, 35, and 90 degrees.

(all the angles in a triangle add up to 180)

7 0
2 years ago
If 16 our of 80 students in a computer class a girls then what percent in the class are boys
mina [271]
80% is the answer to ur question
3 0
3 years ago
LAST ONE! Simplify the following expression.
ELEN [110]

Answer:

5+5root3

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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