5) Hot air is less dense than cool air, so hot air will rise above cool air. Increasing the air temperature inside a hot air balloon makes it lighter than the surrounding air, so the bal-
loon can lift up. The density of hot air is about 0.25 kg/m 3 less than that of cool air,
which means a cubic meter of hot air can lift 0.25kg. What is the minimum volume of hot
air needed to list a hot air balloon carrying 800 kg?
a) 200 m3
b) 3200 m3
c) 1600 m3
d) 400 m

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option a is correct.

only one solution to the system of equations

step-by-step explanation:

if the graph of the equations do not intersects(i.,e if they are parallel) then, there are no solutions that are true for both the equations.

if the graph of the equations intersects, then there is one solution and that is true for both the equations.

since, in the given figure:

the two lines intersect each other

⇒there is only one solution which satisfy both the lines of an equations.

therefore, there is only one solution to the system of equation