6/9=x/21
x=21*6/9
=126/9
x=14
Answer:
- <em> 15</em>
- <em> 42,250</em>
Step-by-step explanation:
The given function is,

where,
P = the total production of apples,
x = the number of trees added.
As the quadratic function has a negative leading coefficient, so it will open downward and at the vertex the value of function is maximum.
The vertex will be at 
The value of the function will be maximum at,

Putting the values,

So at x=15 or for 15 number of trees the production will be ,maximum.
Putting x=15 in f(x) will yield the maximum production of apples.

The 90 degrees one is the bottom left.
The reflection across the x is the top left one.
The 270 degree one is bottom right.
45/3=15 45-15=30 30/5=6 3x6=18 30-18=12 the answer is 12