10x2 = 40x
x = 40x ÷ 10x
x = 4
5 to the second power is read as 5 squared because it is 52 or 5 times 5 or 25. We call a square number for ex: 4 (2 times 2), 16 (4 times 4), et cetera. 8 is not a square number being that none of its factors are a number times itself.
There are none.
None. There is no perfect square that, when doubled, equals 60.
None. The square of any real number must be non-negative.
None, since it is a prime number (unless you consider the 41 times table or the 1 times table).
It is none of those because the square root of -9 is an imaginary number but the square root of 9 is 3 which is a rational integer or whole number
There are none.
None. The ratio of two square numbers is itself a square number. 45 is not.
None - its a prime number and can only be times by itself and one.
There are none. Negative numbers don't have square roots. Well, they do, but they are known as imaginary numbers, and there is no way to determine them. A square root of a number is a number you can multiply by itself and get the original number. There is no number you can multiply by itself to get a negative number, but every positive number has two square roots of the same absolute value.
You cannot. There are some partial rules (eg a square cannot end in 3), but none exhaustive.
None, 114,400 is not divisible by three.