What is the least number that must be added to $4042$ to make it a perfect square?

The sum of squares of two numbers is $90$ and the square of their difference is $46$. The product of the two numbers is

$\sqrt[3]{6 \frac{35}{216}}$ is equal to........

$(13.96)^{2} - (15.03)^{2} + (18.09)^{2} - 32.65 = ?$

$A$ number $N$ is a positive three-digit number. If $x$ is in its hundred's place and $y$ is in its unit's place,then the number $N - 100x - y$ is always divisible by

$25 \%$ of $48 + 50 \%$ of $120 = ? \%$ of $1200$