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Dahasolnce [82]
3 years ago
11

Simplify 5m - 7 - 8m + 10

Mathematics
2 answers:
Bogdan [553]3 years ago
8 0

Answer:

−3m + 3

Step-by-step explanation:

mote1985 [20]3 years ago
5 0

Answer:

-3m + 3

Step-by-step explanation:

You add like terms

So you add 5m to -8m

5 - 8 = -3

-3m

Then you add 10 to -7

-7 + 10 = 3

-3m + 3

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42 is 30% of what number??? Add work plz
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X - the number

30\% x =42 \\
\frac{30}{100}x=42 \\
\frac{3}{10}x=42 \\
x=42 \times \frac{10}{3} \\
x=\frac{420}{3} \\
x=140

42 is 30% of 140.
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Write the domain & range of the function using interval notation.
fgiga [73]
Option A will be the correct answer
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Step-by-step explanation:

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Step-by-step explanation:

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6x − y + z = −3<br> 4x − 3z = −13<br> 2y + 5z = 15<br> Find the solutions?
Alla [95]

Answer:

The solution of the equation are x = - 1 , y = 0 and z = 3

Step-by-step explanation:

Given three linear equation as :

6 x - y + z = - 3        ......A

4 x - 3 z = - 13           ......B

2 y + 5 z = 15            ......C

Solving eq A and C

I.e 2× (6 x - y + z ) = -3 ×2

or, 12 x - 2 y + 2 z = - 6

So, ( 12 x - 2 y + 2 z ) + ( 2 y + 5 z) = - 6 + 15

Or,  12 x + 7 z = 9         ......D

Solving eq B and D

I.e 3 × ( 4 x - 3 z ) = - 13 × 3

or, 12 x - 9 z = - 39

So, (   12 x + 7 z ) - ( 12 x - 9 z ) = 9 + 39

or,  16 z = 48

∴   z = \frac{48}{16}

i.e  z = 3

put the value of z in eq D

So, 12 x + 7×3 = 9  

Or, 12 x = 9 - 21

or,  12 x = - 12

∴   x = -  \frac{12}{12}

I.e  x = - 1

Now, Put The value of z in eq C

or, 2 y + 5 z = 15    

or,  2 y + 5 × 3 = 15

Or,  2 y = 15 - 15

or,  2 y = 0  

∴  y = 0

Hence The solution of the equation are x = - 1 , y = 0 and z = 3  Answer

8 0
3 years ago
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