exam Maths Puzzle Numerical Ability

I need help performing the indicated operation

f(x)=2x-9, g(x)=4x-4

I need to find (f-g)(x)

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exam Other Question

Geometry. The length of a rectangle is 1 cm longer than its width. If the diagonal of the rectangle is 4 cm, what are the dimensions (the length and the width) of the rectangle?

I am needing some help with this, can you please help me? Thanks i dont expect all those problems solved, but i'm having a hard time understanding it. my teacher says i must find the LCD but i don't understand how to find it. and when i try, i a