The number of solutions in each equation are as follows:
- 1 solution: 4^x = 2^{-x}
- 2 solution: 3/2x + 2 = 2^{x} + 1     and     3x + 1 = 2^{-x}.
- No solution: 4^x + 2 = 3^x - 1       and     2x - 5 = 3^{x} + 2.
<h3>How to determine the 
number of solutions?</h3>
In order to determine the number of solutions, we would split the single equation to two different equations and then plot a graph, so as to reveal their solutions.
This ultimately implies that, the number of solutions is equal to the point of intersection between the lines of the equations plotted on a graph.
In conclusion, the number of solutions in each equation are as follows:
- 1 solution: 4^x = 2^{-x}
- 2 solution: 3/2x + 2 = 2^{x} + 1     and     3x + 1 = 2^{-x}.
- No solution: 4^x + 2 = 3^x - 1       and     2x - 5 = 3^{x} + 2.
Read more on number of solutions here: brainly.com/question/12558210
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Speed = distance/time
distance = speed * time
let x = time covered by running
15 = run distance + walk distance
15 = 9(x) + 3(3-x)
15 = 9x + 9 - 3x
15 - 9 = 6x
6 = 6x
x = 1 hour
Therefore: 
Running distance = speed * time
RD = 9km/hr * 1 hr
RD = 9km
        
             
        
        
        
Answer:
To be sure, the result for the equation is approximately: 30,891.0807
Step-by-step explanation:
The calculation for the equation:

 
        
             
        
        
        
Answer:
they ARE equal, the area is 36 ft^2 for both.
Step-by-step explanation:
area = b x h
their bases and heights are equal, so they have the same area. 
9 x 4 = <em>36</em>