Answer:8
Step-by-step explanation:
 First, substitute 7 into the equation for b:
1/3(2x7+10)
Now, simplify using the order of operations:
1/3(14+10)
Then:
1/3 (24)
And you arrive at your answer:
8
 
        
                    
             
        
        
        
Answer:
12.56
Step-by-step explanation:
If a circle has a diameter of 4, its circumference is 3.14*4=12.56.
 
        
             
        
        
        
Answer:
the slope of a horizontal line is 0
 
        
             
        
        
        
X+3
Each number in the right column is 3 more than the value in the corresponding left column.
        
             
        
        
        
Answer: See figure 2 in the diagram below for the table.
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Explanation:
The steps are fairly lengthy to explain in words, but the process is fairly straightforward. Start with figure 1 in the diagram below. The letters A through O represent the steps you'll take to replace them. For instance, you'll replace A with 219 since that's the grand total. Then B is replaced with 137 since we're told that 137 girls were surveyed. Then C gets replaced with 219-137 = 82, and so on. Use arithmetic (adding and subtracting) to gradually replace each letter with the proper number as figure 2 shows. The alphabetical order directly corresponds to the order in which the values are given by your teacher (eg: 219 is first, then 137 next, and so on).
Let me know if you get stuck on any one step, or need me to go into more detail.