Answer:

Step-by-step explanation:
Let
x-----> the population of the city
we know that
using proportion

It is not proportional because 3 should be 45, since it is 3x15
Answer:
4X+12 y
Step-by-step explanation:
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Answer:
-1
Step-by-step explanation:
Given,
f(x) = -x² + 4x - 1 and x = 0
Putting the value of x we get,
f(0)=
+ (4 X 0) - 1
= -0+0-1
=-1
∴f(x)= -1
So, the required value is -1