exam Maths Puzzle Numerical Ability

HELP!!

The price of an item is given by p = 2x2 - 100. Find the
polynomial that represents the revenue generated from the sale of x items.

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Please help me with this problem (solve the equation and show the steps). Thanks!!
14/(x^2-1)+1/(x-1)=3/x+1 COULD SOME ONE HELP? SOLVE EACH SYSTEM OF SIMULTANEOUS EQUATIONS BY USING THE LINEAR COMBINATIONS METHOD. 1. 9x+3y=33 5x-y=13 solution 2. x+3y=6 2x-3y=9 solution 3. 11x-5y=4 16x=20+12y solution