exam Maths Puzzle Numerical Ability

2. a bag of lawn fertilizer claims that it will cover 5,000 square feet of grass. If your yard is 27,500 square feet, how many bags of fertilizer will you need?

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I am having a hard time breaking this one down.

x^4+X^3-8^2+x-6/x^2+1
If a bacteria culture started with a count of 480 at 8:00 am and after t hours is expected to grow to f(t)=480(3/2)^t. I am trying to estimate the number of bacteria in the culture at noon the same day.