ANSWER
Find out the how long will the Yellow balloon be higher than the orange balloon.
To proof
Now  the diagram is given below
As given
A yellow hot-air balloon is 100 feet off the ground and rising at rate of 8 feet per second.
i.e height of the yellow baloon off the ground  = 100 feet 
 rising at rate = 8 feet per second.
.An orange hot-air balloon is 160 feet off the ground and rising at a rate of 5 feet per second. 
i.e height of the orange baloon off the ground  = 160 feet 
 rising at rate = 5feet per second.
Formula

Relative velocity =  rising rate of yellow balloon -   rising rate of orange balloon
= 8 -5
= 3 feet per second
Relative distance =  height of the yellow baloon off the ground -  height of the orange baloon off the ground 
= 160 -100
= 60 feet
put in the formula

= 20 second
after  20 second Yellow balloon will be higher than the orange balloon.
Hence proved
 
 
        
             
        
        
        
Answer:
LCM of 6 and 15 by Listing Multiples
Step 2: The common multiples from the multiples of 6 and 15 are 30, 60, . . . Step 3: The smallest common multiple of 6 and 15 is 30.
 
        
                    
             
        
        
        
Well 33 - 19 = 14 and what do u mean tape diagram?
        
             
        
        
        
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The two linear equations in two variable is:
12 x + 3 y = 40
7 x - 4 y = 38
(a) For a system of equations in two Variable 
a x + by = c
p x + q y = r
It will have unique solution , when

As, you can see  that in the two equation Provided above 
 
So, we can say the system of equation given here has unique solution.
(b). If point (2.5, -3.4) satisfies both the equations, then it will be solution of the system of equation, otherwise not. 
1. 12 x+3 y=40
2. 7 x-4 y=38
Substituting , x= 2.5 , and y= -3.4 in equation (1) and (2),
L.H.S of Equation (1)= 1 2 × 2.5 + 3 × (-3.4)
                              = 30 -10.20
                                = 19.80≠ R.H.S that is 40.
Similarly, L H S of equation (2)= 7 × (2.5) - 4 × (-3.4)
                                                   = 17.5 +13.6
                                                   = 31.1≠R HS that is 38
So, you can Write with 100 % confidence that point (2.5, -3.4) is not a solution of  this system of the equation.