Book Maths Puzzle Numerical Ability

Find the number of divisors of 1080 excluding the throughout divisors,which are perfect squares?
a.28 b.29 c.30 d.31

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The length of a rectangle is 8 feet longer than its width which has the same dimensions as the sides of a square. If the area of the rectangle is equal to 160 square feet more than Please help: If f(x)=ax^2+bx+c has roots 1 and 3 and f(-1)=16 then a=? b=? c=?
Please Please! And if you could please tell me how to solve it, that would be great too! Pleae and