exam Maths Puzzle Numerical Ability

Two problems... but only need one solution!
First part. A rectangular piece of metal is 10 in. longer than it is wide. Squares with sides 2 in. long are cut from the four corners,

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exam Other Question
given: triangle AFE is congruent to triangle BFC

prove: triangle DEF is congruent to DCF
STATEMENTS REASONS I know this may not be the right type of topic for the question but I guessed what i thought was close.

let f(x) = -3x and g(x) = x-4. find (FoG)(-5)
a. 27
b. 11
c. -135
d. -45