Answer:
Option C (2.5, 1) is the right alternative.
Step-by-step explanation:
The given points are:
A = (-1, 5) = (x₁, y₁)
B = (6, -3) = (x₂, y₂)
Now,
The midpoint on X-axis is:
= 
= 
= 
= 
The midpoint on Y-axis is:
= 
= 
= 
= 
= 
Thus the midpoint of AB is "2.5, 1".
We will say that d = 1 dozen. and y = cost
we know that 3 dozen is 48. so
3d = 48.
to get the cost of 1d, we have to get the 3 to change into a 1. the only way to do this is to divide 3 by 3. if we divided the left side by 3 we must also do the right so:
3d = 48
1d = 16
so 1 dozen = 16
to change 3d into 9d we have to multiply by 3. we again have to do this to both sides. so:
3d = 48
9d = 144
A quick way to do this is by recalling the fact that
, so the largest value that
alone (for any real value of
) can take on is 1.
This means
, and so
.
So the maximum value of this function is 7.
He would need 1194 square inches of wrapping paper
