D=28okm t=4h s? it is a time and distance

For the equations below which statement is true ? -2x=14 6x=-42

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)