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3 years ago

If 12,000 people voted in the election, and 35% of them were 50-64, how many people were 50-64?

Mathematics

2 answers:

Mariulka [41]3 years ago

8 0

4,200

x over 12,000
35 over 100
Cross multiply
Simplify

Sergio039 [100]3 years ago

6 0

35% of 12,000.....turn percent to decimal..." of " means multiply
0.35(12,000) = 4200 <==

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The half life of silicone-32 is 710 years. If 30 grams is present now, how much will be present in 300 years?

Irina18 [472]

Answer:

22.38 g of silicone-32 will be present in 300 years.

Step-by-step explanation:

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by

$N(t)=N_0(\frac{1}{2})^{\frac{t}{t_{1/2}}$

where,

$N(t)$ = quantity of the substance remaining

$N_0$ = initial quantity of the substance

$t$ = time elapsed

$t_{1/2}$ = half life of the substance

From the information given we know:

The initial quantity of silicone-32 is 30 g.
The time elapsed is 300 years.
The half life of silicone-32 is 710 years.

So, to find the quantity of silicone-32 remaining we apply the above equation

$N(t)=30\left(\frac{1}{2}\right)^{\frac{300}{710}}=30\left(\frac{1}{2}\right)^{\frac{30}{71}}\approx22.38 \:g$

22.38 g of silicone-32 will be present in 300 years.

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2 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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mestny [16]

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2 years ago

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lions [1.4K]

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Answer:

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Step-by-step explanation:

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