book Maths Puzzle Numerical Ability

On a shelf there are four mathematic books and eight english books. if the books are to be arranged so that the mathematics books are together, in how many ways can this be done?

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Hello - Could a tutor please help me with the below problem. I don't even know where to start! In advance, thanks for your assistance!

Write the partial fraction decompositi Handy andy sell one-gallon cartons of milk (4quarts) for $3.09 each half-gallon cartons for $1.65 each. Assume that the number of cents you pay for a carton of milk varies linearl