exam Maths Puzzle Numerical Ability

The cost for a long distance telephone call is $0.36 for the first minute and .21 for each additional minute or portion there after.Write an inequqlity representing the number of minutes a person could talk without exceeding $3.00.

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I need some help with log please

Solve ln(3+3x)-ln(x-4)=ln5

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Is it possible to generalize a condition for creating any two bionomials whose sum is a monomial and two bionomials whose sum is a trinomial?