Explain why multiplying two negativenumbers results in a positive product using a model.
1 answer:
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Given equation is
It gives approx world population in billions for t years since 2004.
Answer(a):
Compare with growth formula P=a(b)^t, we get:
growth factor b = 1.0126
We know that if r is the percent rate of growth then
1+r=b
1+r=1.0126
r=0.0126
Hence the yearly percent rate of growth of the world population is 0.0126 or 1.26%.
Answer(b):
To find worlds population in 2004, plug t=0 because year is counted from 2004.
Hence answer is 6.40 billion.
To find worlds population in 2018, plug t=2018-2004=14 because year is counted from 2004.
Hence answer is approx 7.63 billion.
Answer(c):
Average rate of change of the world population between 2004 and 2018 is given by:
Hence answer is approx 0.0878571428571 billion per year.
To convert it into millions, multiply by 1000
So we get 0.0878571428571*1000 = 87.8571428571
Which is approx 88 to the nearest integer
Hence final answer is approx 88 millions per year.
Let the two numbers be x and y. The sum of x and y is 14 and the difference is 20. We can write a system of equations and solve:
Then substitute x back into one of the equations to find y:
So the two numbers are 17 and -3
Then substitute x back into one of the equations to find y:
So the two numbers are 17 and -3