exam Maths Puzzle Numerical Ability

suppose f(x)=2x+5 and g(x)= -1/3x +2. Find each value.
1) 2g(7)

can someone explain this to me?

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exam Other Question

write the equation and graph using:
slope: -2 y int: (0,4)
(6m^0)(3^-1m^2n^-4) I got this incorrect on homework and need to correct it. I do not understand how to solve the equation. how do i solve this equation?