Answer:
A
Step-by-step explanation:
The profit for selling <em>x</em> pairs of shoes is given by:

And we want to determine the number of pairs that needs to be sold in order to maximize profit.
Since the function is a quadratic with a negative leading coefficient, the maximum profit will occur at its vertex point. The <em>x-</em>coordinate of the vertex of a quadratic is given by:

In this case, <em>a</em> = -4, <em>b</em> = 32, and <em>c</em> = -39. Substitute and evaluate:

So, in order to maximize profit, only four pairs of sohoes should be sold.
Our answer is A.
Answer:
The answer is C
Step-by-step explanation:
Straight angles means a line which straight and has no turning.
Answer:
84
Step-by-step explanation:
The tens digit can be 8, 6, 4, or 2 since the ones digit can only be a whole number, so that means it can only be 4, 3, 2, or 1.
If we try all possible combinations (84, 63, 42, 21) and subtract 36 from them, you will find the answer is 84. (84 - 36 = 48)
Step-by-step explanation: