Answer:
2 to 3, 4 to 6, 8 to twelve 
Step-by-step explanation:
the boys are first, girls second 
 
        
                    
             
        
        
        
Answer:  f(x)= 2x -3 
Step-by-step explanation:
Using the given information we can come up with two points that will be use to find the slope and y-intercept.  
If you input 0 you get -3  so the point will be (0,-3) 
If you input 7  you get 11  so the point will be (7,11) 
Now use the points to find the difference in their y coordinates and divide it by the difference in their x coordinates to find the slope. 
y coordinates:  -3 - 11 = -14 
x coordinates:  0 - 7 = -7 
   -14/-7 = 2 
Since the slope is two, we will use the slope intercept formula (y = mx +b) to find the b which is the y intercept. 
Use one of the points and input its x and y coordinates into the formula including the slope to solve for b. 
-3= 2(0) +b 
-3 = 0 + b 
 b = -3  
f(x) is the same as y in the formula, meaning that the equation will be  
  f(x) = 2x -3 
 
        
             
        
        
        
The complete table will be: 

<u><em>Explanation</em></u>
Suppose, the number of sit-ups in Sunday is 
Mean is the simple average of some numbers. <u>For finding the mean number</u> of sit-ups per day, we need to <u>divide the 'total number of sit-ups' by the 'total number of days'</u>. 
Here the total number of days is 7 and the total number of sit-ups for 7 days 
Given that, the mean number of sit-ups per day is 100. So, the equation will be...

So, the number of sit-ups you have to do Sunday is 175. 
 
        
             
        
        
        
Join the centre O to the chord (let it be MN) & let OH be the perpendicular to the chord
OH bisects MN into 2 equal parts (each one is x/2)
OMH is a right triangle with one side =8, the second leg =x/2 & the hypotenuse = 12 (Radius)
Apply Pythagoras:
12² = 8² +(x/2)² ==>144=64 + x²/4 ==> x²=4(144-64) =320 
x²=320==> x=√320 =17.88 ≈17.9