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givi [52]
4 years ago
6

Hellllllllpppppppppppppppppp

Mathematics
2 answers:
Katen [24]4 years ago
7 0
7/9

-(2/9) - ( - 1)

-(2/9) + (1)

-(2/9) + (9/9)

7/9
IrinaVladis [17]4 years ago
6 0

Answer:

7/9

Step-by-step explanation:

Since a negative times a negative is positive, -(-1) becomes + 1 so the expression becomes -2/9 + 1. Using the commutative property of addition (a + b = b + a), we can rewrite this as 1 - 2/9. 1 = 9/9 so the expression becomes 9/9 - 2/9 = 7/9.

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Explain if the combination of iron and copper sulfate is an example of a chemical reaction
zysi [14]

Answer:

Yes it is.

Step-by-step explanation:

When we mix Fe(iron) to CuSO⁴ (Copper sulphate), Iron removes copper from CuSO⁴ and makes FeSO⁴. This happens because iron is more reactive than copper. We cannot remove iron from this solution now until any stronger element is added.

6 0
3 years ago
Read 2 more answers
15. The sum of two numbers is 8. The difference of the two numbers is 2.
matrenka [14]

Answer:

3 AND 5

Step-by-step explanation:

LET THE TWO NUMBERS BE X AND Y

THEN

X + Y = 8 …….1

X – Y = 2 …… 2

WE SOLVE SIMULTANOUSLY  

SUBTRACTNG EQATION 2 FROM 1

X – X  + Y – (-Y) = 8 – 2

Y + Y = 6

2Y = 6

DIVIDING EACH TERM BY 2

2Y/2 = 6/2

Y = 3

THEN PUTTING Y = 3 IN EQUATION 1

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X = 8 – 3

X = 5

5 0
3 years ago
Solve and graph –7 < w – 4 < 2
Nikitich [7]

Answer:

solution: -3<w<6

interval notation: (-3,6)

Step-by-step explanation:

The coordinates are (-3,6) all you have to do is put them on a graph! Hope this helps!

8 0
3 years ago
What undefined term defines an parellel line
ss7ja [257]
Parallel lines- lines that can go on and on without touching each other.
6 0
4 years ago
in a theater there are 200 seats adult tickets cost $12.50 and child tickets cost $6.25 the cinemas goal is to sell at least $15
Nat2105 [25]
X=$12.50
y=$6.25

$12.50x+$6.25y (> and =) $1500

5 0
3 years ago
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