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Vladimir [108]
3 years ago
10

4. Use Structure Explain why the sum x + X IS equal to 2x instead of x2.

Mathematics
2 answers:
aleksklad [387]3 years ago
8 0

Answer:

x + x = (1 + 1)x = 2x \\  \\ x \times x =  {x}^{1 + 1}  =  {x}^{2}

WARRIOR [948]3 years ago
7 0

Answer:

x+x is 2x because there coefficients are added and when two x's are multiplied their powers are added

Mathematical Explanation:

x+x=x(1+1)=x(2)=2x

Now

Multiplication:

x•x=x^(1+1)=x^2=x²

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the line passing through the points A (-1,3k) and B (k , 3) is parallel to the line whose equation is 2y+3x=9. write down the co
vodomira [7]

Answer:

k = 3

Step-by-step explanation:

If the line passing through the points A (-1,3k) and B (k , 3) is parallel to the line whose equation is 2y+3x=9, then their slopes are equal

For coordinate AB;

slope m1 = 3 - 3k/k-(-1)

m1 = 3-3k/k+1

For the line 2y+3x = 9

2y = -3x + 9

y = -3/2 x + 9/2

Slope m2 = -3/2

Since m1 = m2

3-3k/k+1 = -3/2

Cross multiply

2(3-3k) = -3(k+1)

Expand

6 - 6k = -3k - 3

-6k+3k = -3 - 6

-3k = -9

k = -9/-3

k = 3

Hence the value of k is 3

4 0
3 years ago
14 is 56% of what number
Sedbober [7]
7.84  <span> 56% off 14 is equal to (56 x 56) / 100 </span>
8 0
3 years ago
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5(wx-v)=9(x+v)<br> make x the subject
Zepler [3.9K]
Expand the brackets first
5(wx-v) = 9(x + v) 
5wx - 5v = 9x + 9v

Get all x's on one side and everything on on the other side
9x - 5wx = 9v + 5v

factorise out the x
x(9-5w) = 14v

then divide by 9-5w
x = 14v/(9-5w)


3 0
3 years ago
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What is the solution to the equation sqrt n= sqrt 3n-3 +1?​
inna [77]
The answer would be n = 1
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3 years ago
Solve P = 8/3 R + 30 for R.
vampirchik [111]

Answer:

R = (3P-30)/8

Step-by-step explanation:

subtract 30 from each side to get:

P-30 = \frac{8}{3}R

multiply each side by \frac{3}{8} to get:

\frac{3}{8} · P - 30 = R

R = (3P-30)/8

7 0
3 years ago
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