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torisob [31]
2 years ago
7

Will mark brainliest, rate and thank pls answer. I don't need an explanation just an answer 3t+8(2t-6)=12+14t 2v+18=16-4(v+7) 4x

-(9-3x)=8x-1 12(3+y)=5(2y+8)
Mathematics
1 answer:
marshall27 [118]2 years ago
6 0

Answer:

see below

Step-by-step explanation:

3t+8(2t-6)=12+14t

Distribute

3t +16t-48 = 12+14t

Combine like terms

19t -48 = 12+14t

Subtract 14t from each side

5t -48 = 12

Add 48 to each side

5t = 60

Divide by 5

t =12

2v+18=16-4(v+7)

Distribute

2v+18  = 16 -4v -28

Combine like terms

2v +18 = -4v -12

Add 4v to each side

6v+18 = -12

Subtract 18 from each side

6v = -30

Divide by 6

v = -5

4x-(9-3x)=8x-1

distribute

4x -9+3x = 8x -1

Combine like terms

7x -9 = 8x -1

Subtract 7x from each side

-9 = x-1

Add 1 to each side

-8 =x

12(3+y)=5(2y+8)

Distribute

36 +12y = 10y +40

Subtract 10y from each side

36+2y = 40

Subtract 36 from each side

2y =4

Divide by 2

2y/2 = 4/2

y =2

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Isotope ⁷⁹br has an abundance of 50.69%
Simora [160]

Answer:

79.986

Step-by-step explanation:

Let A represent isotope ⁷⁹Br

Let B represent isotope ⁸¹Br

From the question given above, the following data were obtained:

For Isotope A (⁷⁹Br):

Mass of A = 79

Abundance of A (A%) = 50.69%

For isotope B (⁸¹Br):

Mass of B = 81

Abundance of B (B%) = 49.31%

Relative atomic mass of Br =?

The relative atomic mass (RAM) of Br can be obtained as follow:

RAM = [(Mass of A × A%) /100] + [(Mass of B × B%) /100]

= [(79 × 50.69) /100] + [(81 × 49.31) /100]

= 40.0451 + 39.9411

= 79.986 amu

Thus, the relative atomic mass of Br is 79.986

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