The answer should be C: 12
Answer:
144
Step-by-step explanation:
................
Check the hundredth position after the decimal point.
This = 7 so we add 1 to the tenth position so 7 becomes 7+1 = 8
Answer is 27.8 to nearest tenth
Answer:
16 years
Step-by-step explanation:
Let x represent the number of years. The suburb population is growing at a rate of 5000 per year after x years, it can be represented by the equation:
320000 + 5000x
The city population is declining at a rate of 14000 per year after x years, it can be represented by the equation:
624000 - 14000x
The number of years for the city and suburb population to be equal can be gotten from:
320000 + 5000x = 624000 - 14000x
14000x + 5000x = 624000 - 320000
19000x = 304000
x = 304000 / 19000
x = 16
In 16 years the populations of the suburb and the city be equal
For

and

to be inversely proportional, there must be some constant

such that

Given that

when

, it follows that

Then when

, we have