Larinadiaz5554
24.04.2020 •
Mathematics
Let (fx) = –5x – 4 and g(x) = 6x – 7. Find (fx) + g(x).
A.
–11x + 3
B.
x + 3
C.
–11x – 11
D.
x – 11
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Ответ:
f(x) + g(x) Substitute/plug in (-5x - 4) into "f(x)" since f(x) = -5x - 4, and plug in (6x - 7) into "g(x)" since g(x) = 6x - 7
(-5x - 4) + (6x - 7) Combine like terms(terms that have the same variable and power/exponent)
-5x + 6x - 4 - 7 (I rearranged the terms to be next to their like term)
x - 11 Your answer is D
Ответ:
a) The population in 2020 will be of 7.14 million people.
b) It will take 9.23 years for the population to drop below 7 million people
Step-by-step explanation:
Exponential equation for population decay:
The equation that models a population in exponential decay, after t years, is given by:
In which P(0) is the initial population and r is the decay rate, as a decimal.
The total population of a European country is decreasing at a rate of 0.6% per year.
This means that
In 2014, the population of the country was 7.4 million people.
This means that
. Then
a) What is the population likely to be in 2020 if it decreases at the same rate?
2020 - 2014 = 6, so this is P(6).
The population in 2020 will be of 7.14 million people.
b) How long will it take for the population to drop below 7 million people?
t when P(t) = 7. So
It will take 9.23 years for the population to drop below 7 million people