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kari74 [83]
2 years ago
9

What is the variable in the expression 2X - 25

Mathematics
1 answer:
SpyIntel [72]2 years ago
8 0
The variable is x.

Hope that helps :)
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OLga [1]

Answer:

47.04 square feet

Step-by-step explanation:

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2 years ago
1. Solve for x.<br> 12<br> 10<br> X<br> 5
Andru [333]
We can use proportions
12/x = 10/5
12*5 = 10x
60 = 10x
x = 6

Check
12/6 = 10/5
2 = 2
3 0
1 year ago
PLS HELP I HAVE TO DO GYM OR I WILL GET A BAD GRADE HELP I NEED THIS DONE
zlopas [31]

Answer:

1. Yes, 34+12=46

2.No, 22-9=13

3. Yes, 6*9=54

4. Yes, 39/3=13

5. k=4 7+4=11

6. p=37 37+24=13

7. h=23 23+16=7

8. m=13/30 2/5+13/30=5/6

9. w+15=190 w=175

i hope this helps:)

4 0
3 years ago
Please can someone prove this equation
zubka84 [21]

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

sin²x + cos²x = 1

Consider the left side

2cos²A - 1 ← replace 1 by sin²A + cos²A

= 2cos²A - ( sin²A + cos²A)

= 2cos²A - sin²A - cos²A

= cos²A - sin²A = right side ⇒ verified



6 0
2 years ago
7 divided by 4 x + 3 Y + 4 divided / 4 x minus 3 Y is equal to 5 / 4
DerKrebs [107]

9514 1404 393

Answer:

  (x, y) = (4, 4)

Step-by-step explanation:

If you attempt to solve this by clearing fractions, you end up with an extraneous solution. Here, we'll solve the linear equations ...

  7a +4b = 5/4

  8b -14a = 3/2

where a = 1/(4x+3y) and b = 1/(4x-3y)

Dividing the second equation by 2 and adding the first, we have ...

  (7a +4b) +1/2(8b -14a) = (5/4) +1/2(3/2)

  8b = 8/4

  b = 1/4

Substituting into the first equation gives ...

  7a +4/4 = 5/4

  a = 1/28

__

Now, we can get back to solving for x and y.

  4x +3y = 1/a = 28

  4x -3y = 1/b = 4

  8x = 32 . . . . . . . . . add the two equations

  x = 4

  3y = 28 -4x = 28 -4(4) = 12 . . . . . use x in the equation for 'a'; rearrange

  y = 4 . . . . divide by 3

The solution to the system of equations is (x, y) = (4, 4).

_____

<em>Additional comment</em>

If you graph these equations, you find they describe hyperbolas that intersect at (0, 0) and (4, 4). The "solution" (0, 0) is extraneous, as both equations are undefined there.

7 0
2 years ago
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