exam Maths Puzzle Numerical Ability

Still having a little trouble with linear cost functions. Question is:
A small family bakery specializes in baking cheesecakes. The fixed cost of production is $245, the marginal

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2 - u = 3(x-y) +6
x + y = 50 + z + u
x - y + z - u = 42
1-(1+07) raise to negative 3 exponet