exam Maths Puzzle Numerical Ability

I need to simplify 6.7x(3x-2y)+1.2(x^2-y^2)

Heres what I have completed 20.1x^2-13.4xy+1.2x^2-1.2y^2 = 21.3x^2-1.2y^2-13.4xy

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exam Other Question

find the distance between (-3,-2) and (1,4)

a 27

b 2 square root 5

c 2 square root 13

d square root 10 Construction. A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400 ft^2, what is the width of the path?