exam Maths Puzzle Numerical Ability

a picture frame measures 34cm by 17cm. There is a 318cm^2 of picture showing. The frame is uniform thickness. Find the thickness of thr frame.

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My question is combination word problem and cost funtion. I struggle a lot with these please assist.

Assume each of the following can be expressed as a linear cost function. Fi
Which of the following exponential functions best describes the table below?
x: -0.1,0,0.1,0.2
y: 6,3,1.5,0.75
Is it:
a) y=6(1/2)(^10x)
b) y=3(1/2)(^x/10)
c) y=3(1/2)(^10x)