x5 can be read as x to the power of 5 or more commonly as x to the fifth power.
you just do this x^5 :)
5 x 5 x 5
5^3 = 5 x 5 x 5
5 x 5 x 5 x 5 = 625
2 x 2 x 2 x 2 x 5 x 5 x 5
(2 x 5)2
3 x 3 x 3 x 3 x 3
3 x 3 x 3 x 3 x 3 = 243
604,100
The normal way to write this is: x3 (meaning x cubed / x to the third power).
Three and four tenths multiplied by ten to the fifth power
how you write out 3 to the fifth power is you have to use exponent's example:2x2x2x2x2 that's 2 to the fifth power