exam Maths Puzzle Numerical Ability

Please help me with this equation..thanks so much.

f is a function defined by f(x)=-x/5 and g is a function defined by g(x)=7-3x
then 4g-5f=

this was on the board in class..i am not sure where to begin..thanks

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exam Other Question
Can someone help me on this problem?

I need to evaluate the function on this problem for the value specified.

f(x) = x^2 - 7x + 10; find (a) f(0), (b) f(5), and (c) f(-2).

Thanks so much,
Sher A which of the following points is on the line y = 3x - 7? (3,3) (3,2) (3,1) (3,0) Describe where each of the other three points is in relationship to this line.

B find anoth