exam Maths Puzzle Numerical Ability

please help me set up and solve this problem and simplify

2/5x-45 + x/x^2-81

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exam Other Question

what is the difference of 3 and 5 times a number? a(b+c) is the equations I am suppose to use Landscaping: at an excavation site a conical pile of earth 9 ft high and 14 ft in diameter at the base must be hauled away by a small truck with a capacity of 2.6 cu yd. How many truckloads will it take to transport the soil? Be careful with units.