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mamaluj [8]
3 years ago
5

What number is 35% of 80?

Mathematics
1 answer:
Wittaler [7]3 years ago
4 0
What number is 35% of 80?

35/80 

35 ÷ 80 = <span>0.4375

</span>0.4375 × 100 = <span>43.75
</span><span>43.75%
</span>
43.75% is 35% of 80. 
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2. The number of atoms of a particular chemical element is modelled by
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9514 1404 393

Answer:

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  b) see below

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Step-by-step explanation:

a) The value of y when x=0 is the coefficient of the exponential term:

  y = 600·3^(-0) = 600·1 = 600

There were 600 atoms to start.

__

b) see attached for a graph

__

c) The graph shows 150 atoms at t = 1.26, about 1.26 hours after the start of time counting.

If you want to find that value algebraically, substitute for y and solve for x. Logarithms are involved.

  150 = 600·3^(-x)

  150/600 = 3^(-x)

  log(1/4) = -x·log(3)

  x = -log(1/4)/log(3) = log(4)/log(3) ≈ 1.2618595

After about 1.26 hours, there were 150 atoms.

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3 years ago
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