exam Maths Puzzle Numerical Ability

The cost of peaches varies directly with the number of pounds bought. If 3 pounds of peaches cost $4.50, find the cost of 505 pounds.

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Please, I can't figure this out! I don't even know where to begin!

Simplify.

x+2 over x divided by x-2 over 3x An object is projected upward from the top of a tower. Its distance in feet above the ground after t seconds is given by s(t)=16t^2+64t+80. How many seconds wil it take to reach ground level?