Answer:
128mm
Step-by-step explanation:
Given


Required
Determine the length of the openings of the pipe
To do this, we simply add 40mm to the length of the pipe.
This gives:


<em>Hence, the opening must be 128mm</em>
Answer:
X^2+7x+4
Step-by-step explanation:
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.
What is the rest of the question?