Answer:
A. Tennis: 6x+12
A. Basketball: 7x+36
B. Tennis: Length- 36, Width- 72
B. Basketball: Length- 50, Width: 94
Step-by-step explanation:
A. Tennis
perimeter equation: P= 2L+2W
P=2(x)+2(2x+6) simplify
P= 2x+4x+12
P=6x+12
A. Basketball
P= 2(1/2x+32)+2(3x-14) simplify
P=7x+36
B. Tennis and basketball 
just plug in 36 for x for the original lengeth and width equations for each court
 
        
                    
             
        
        
        
Multiplying both sides of the equation by 3 and substituting 4 for p
        
             
        
        
        
If you have 8 yellow balloons for every 12 blue balloons, then if you have 20 balloons in total, 8 out of 20 of those balloons will be yellow. Then you can set up this ratio:

Then, you can use either cross multiplication or multiply the numerator and denominator by the same number to help solve for x. Personally, I prefer cross multiplication, so that's what I'll show you here:

Finally, solve for x:

If you had 100 balloons, you will have 
40 yellow balloons.
Hope this helps!!
 
        
             
        
        
        
Answer:
-14
Step-by-step explanation:
(-4)(5)+(-3)(-2)
=-20+6
=-14