book Maths Puzzle Numerical Ability

find the cost per unit during a week when the total cost was 68,000, the number of units produced was 500, and the fixed costs were $8000. use the formula T=U.N+F where T is the to

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I tried finding a solver on the site to find the reciprocal for this question.
y^2+5y-9 / y^2-9y+3
This is a bit tricky.
I simply dont understand it. Solve each compound inequality and write the solution set using interval notation.

a) 3<5x/2 +4 is less than or equal to 12 AND 2x > 3x/2 +1/8

b)