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3 years ago

Out of 21 Students in a class three seventh are boys and Four seventh are girls. How many are girls and how many are boys

Mathematics

1 answer:

konstantin123 [22]3 years ago

3 0

Answer: 9 boys and 12 girls

Step-by-step explanation:

21 * 3/7 = 9

21 * 4/7 = 12

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3 years ago

Given ABCD, AC = 28, and AE = 3x - 7, find the value of x.

ki77a [65]

AE is about half of AC. What I did was get half of 28, which is 14, and represented one of the numbers.
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3 years ago

Read 2 more answers

The population of rabbits on an island is growing exponentially. In the year 1994, the population of rabbits was 9600, and by 20

drek231 [11]

Answer:

49243

Step-by-step explanation:

Given that the population of rabbits on an island is growing exponentially.

Let the population, $P=P_0e^{bt}$

where, $P_0$ and b are constants, t=(Current year -1994) is the time in years from 1994.

In 1994, t=0, the population of rabbit, P=9600, so

$9600=P_0e^{b\times 0}$

So, $P_0=9600$

and in 2000, t=2000-1994=6 years and population of the rabbit, P=18400

$18400=9600 \times e^{b\times 6} \\\\\frac{18400}{9600}=e^{b\times 6} \\\\$

$\ln(23/12}=6b \\\\$

$b = \frac{\ln{1.92}}{6} \\\\$

b=0.109

On putting the value of P_0 and b, the population of the rabbit after t years from 1994 is

$P=9600 \times e^{0.109\times t}$

In 2009, t= 2009-1994=15 years,

So, the population of the rabbit in 2009

$P=9600 \times e^{0.109\times 15}=49243$

Hence, the population of the rabbit in 2009 is 49243.

7 0

3 years ago