Answer:
The expression is not defined in a set of real numbers.
The square root of a negative number is not defined in the set of real numbers.
Answer:
B
Step-by-step explanation:
distribute
5x+15-9x+4
combine like terms
-4x+19
Constraints are simply the subjects of an objective function.
The inequality that represents the constraint is: 
Represent the number of hats with x, and the number of scarves with y.
From the question, we have:
- He spends 12 hours to knit a hat
- He spends 6 hours to knit a scarf
So, the equation of the total time spent is:

This time spent is not more than 20 hours.
So, the inequality is

Hence, the inequality that represents the constraint is: 
Read more about constraints at:
brainly.com/question/24574823
25*8.14=?
Multiply the cost of the book per person ($8.14) by the number of people (25).
Answer:b=16
Step-by-step explanation:trust me bro