exam Maths Puzzle Numerical Ability

in parallelograms ABCD abovewhat is the value of x?
10x (25x-30)

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points 60, $1635 120, $1770 I got a slope of 2.25 My intercept is 1,500. Not sure if this is right. Let x represent packages and y cost. What is the cost to send 200? What would my equation look like? Thanks If y(x-1)=z then x=
NEED SOME ASSISTANCE, THANKS