Answer:
Option (b) is correct.
The profit from sales if the price of the T-shirts were $15 a pieces is $28.
Step-by-step explanation:
Given : The function
is used to determine the profit on T-shirts sold for x dollars.
We have to find the profit from sales if the price of the T-shirts were $15 a pieces.
Consider the given profit function 
For the profit, if the price of a t-shirt is $ 15
Put x = 15, we have,

Simplify, we have,

Also, 
Thus, we get, The profit from sales if the price of the T-shirts were $15 a pieces is $28.
The diagonals of a square bisect one another and are perpendicular.
so 21x+ 16.5 = 90
subtract 16.5 from each side
21x = 73.5
divide by 21 on each side
21x/21 = 73.5 /21
x = 3.5
Answer:
Slope of Line 1 = 4/3
Slope of Line 2 = 1/2
Slope of Line 3 = 4/3
For each pairs of lines, determine whether they're parallel, perpendicular or either.
Line 1 and Line 2: neither
Line 1 and Line 3: parallel
Line 2 and Line 3: neither
Answer:
From my knowledge and my research the answer is B! Thank you
Step-by-step explanation: