exam Maths Puzzle Numerical Ability

add using the vertical method

5x^2+2x-4
x^2-2x-3
and
2x^2-4x-3

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exam Other Question

Simplify: A to the power of 0 times B to the -1 power times C to the -2 power cost of gravel a gravel dealer charges $50 plus $30 per cubic yard for delivering a truckload of gravel. Express the total cost C(n) in dollars as a function of the number of cubic yards delivered n. Find C(12).