3 years ago

How do you convert percents to fractions and decimals?

1 answer:

8 0

Answer:

Divide the percentage by 100 to get a decimal number. Use that number as the numerator (top) of a fraction. Put a 1 in the denominator (bottom) of the fraction. Convert the decimal to a whole number: Count how many places are to the right of the decimal.

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A country's population in 1992 was 72 million. In 1998 it was 76 million. Estimate the population in 2012 using the exponential

stepan [7]

We assume the annual percentage increase is the same. We will work out the constant k using the formula

We have
P = 76
A = 72
t = 6 years (from 1992 to 1998)

Substitute into the formula
$76=72e^{6k}$
$\frac{76}{72}=e^{8k}$
Take log both sides give
$ln( \frac{76}{72})=ln(e^{6k})$
$0.05406722127=6k$
$k=0.009$

We can now work out the number of population by the end of 2012 using the formula

We have
A = 72 million
k = 0.009
t = 10 years (1992 to 2012)

$P=72e^{0.009*10}$ $P=78.78$ ≈79 million

7 0

3 years ago

Is this "N2 + 3H2 → 2NH3" balanced or no?

romanna [79]

Yes, the equation “N2 + 3H2 = 2NH3” is balanced.

5 0

3 years ago

A classroom has 12 girls for every 4 boys. What is the ratio of boys to total students?

guapka [62]

Step-by-step explanation:

4:16

No it's ok no need to thank me, it's my duty to help someone like you