book Maths Puzzle Numerical Ability

Question
1)p3+27
2)m2-2m-15
3)(0.9x+0.7y)
4)x2-6x+8
5)(x+3y)3

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book Other Question

A long-distance phone call costs $0.70 for the first minute and $0.39 for each additional minute or portion thereof. Write an inequality representing the number of minutes a person could talk without exceeding $4. how do i write 19/7 as a mixed number?