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Marina86 [1]
3 years ago
14

Help please , will mark

Mathematics
1 answer:
Andrews [41]3 years ago
7 0

Answer:

384 in²

Step-by-step explanation:

SA = 2(8²) +  2(8²) + 2(8²) = 384

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The double number line below shows the approximate number of kilograms in a certain number of pounds:
snow_tiger [21]

Answer:

4.00

Step-by-step explanation:

1.00kg=3 pounds

2.00kg=5pounds

3.00kg=7pounds

4.00kg=9pounds

6 0
3 years ago
6) -(-2-n)<br> help pls pls
coldgirl [10]

Answer:

-(-2-n)

open the bracket with the subtraction sign

2+n

3 0
3 years ago
The perimeter of a triangle DEF is 81 units. The length of side DE is twice the length of side EF, and the length of side DF is
GenaCL600 [577]

Answer:

5s = 85

Step-by-step explanation:

Perimeter of our triangle = DE + EF + DF = 81 units

We know from the question that

The length of side DE is twice the length of side EF

DE = 2EF

and the length of side DF is 4 units less than the length of side DE

DF = DE - 4

We can replace EF with s in our equations

DE = 2s

And now we can replace DE from the other equation

DF = DE - 4

DF = 2s - 4

If the perimeter of our triangle = DE + EF + DF = 81 units

We will replace the sides with our new values

Perimeter = 2s + s + 2s - 4 = 81

We can put this as our answer, or we can simplify further

Simplify by adding 4 to both sides

2s + s + 2s - 4 + 4 = 81 + 4

Simplify

2s + s + 2s = 85

Simplify

5s = 85

Since the question only asked for an equation, not for us to solve it, we can stop here

<em>(If you wanted to solve for s, just divide both sides by 5)</em>

<em>5s / 5 = 85 / 5</em>

<em>s = 17</em>

7 0
3 years ago
Read 2 more answers
Help! I need this to pass my class.
alexandr402 [8]

Answer:

What do you need help with?

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
What is the value of the x variable in the solution to the following system of equations?
satela [25.4K]
Let's use the addition/subtraction method.

Suppose we wish to eliminate variable x.

Mult the first eqn by 5:  10x - 15y = 15
Mult the 2nd eqn by -2: -10x+ 4y  = -8

Add these two equations together:  -11y = 7, and y = -7/11.

Subst. -7/11 for y in either given equation and find x.

Then your solution is (x,y)   (subst. the values we've found for x and y).

4 0
3 years ago
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