For any integral value of $n$,$3^{2n} + 9n + 5$ when divided by $3$ leaves the remainder:

When $335$ is added to $5A7$, the result is $8B2$. $8B2$ is divisible by $3$. What is the largest possible value of $A$?

There is a number consisting of two digits. The digit in the units place is twice that in the tens place,and if $2$ is subtracted from the sum of the digits,the difference is equal to $1/6^{\text{th}}$ of the number. The number is:

$(2+\sqrt{5})^{2}=?+4 \sqrt{5}$

$\frac{28 \times 36}{18 \% \text{ of } 50} = ?$

$(21.98)^{2} - (25.02)^{2} + (13.03)^{2} = ?$