All except 0. The inequality is saying that x must be less than or equal to 3 which all answers except 0 are.
        
                    
             
        
        
        
Answer:
a. f(0) = 4
b. f(6) = 8
Step-by-step explanation:
This is a piecewise function, so the actual equation is on the left, and the inequalities are on the right.
If x = 0, this would fall under the first part of the function because x < 5 is the requirement for the first part. Then, evaluating it: f(0) = 0 + 4 = 4.
If x = 6, this would fall under the second part of the function because 5  x < 7 is the requirement. 6 falls under this category, so that means the second part of the function is used. Because it is a constant, 8, this evaluates to f(6) = 8.
 x < 7 is the requirement. 6 falls under this category, so that means the second part of the function is used. Because it is a constant, 8, this evaluates to f(6) = 8.
 
        
             
        
        
        
1.
Checking the numbers that are greater than 10 in this set, we have:
11.2 and 12
2.
The numbers in this set that are lesser than or equal 9 are:
0, 4.5, 5 and 9
3.
Solving the inequality, we have:

Three values greater than 7 are:
8, 9, 10
4.
Solving the inequality, we have:

Three values smaller than 5 are:
4, 3, 2
5.
Solving the inequality, we have:

Three values greater than or equal 10 are:
10, 11, 12
 
        
             
        
        
        
N= the # of books
So you're trying to find n and you have the cost for the printed books, which is 15,000, so you would set up your equation like this:
15,000=500+10n 
Subtract 500 from each side
14850=10n 
Divide by 10
n=1,485 books are printed
        
             
        
        
        
Answer: n = 63
Step-by-step explanation:
n ÷ 21 = 3
Do the opposite to find n!
3 × 21 = 63
So, to check our answer
63 ÷ 21 = 3
n = 3
:))