20000 using the exponent of 4 = 11.89214fourth root of 20000 = 11.8921
23 or 81
Exponent are easy, just count the amount of 7s or whatever # you are using and put that number to the top right
Exponents describe mathematical operations that can also be written in other ways (although not necessarily in the form of an equation). For example, 103 can also be written as 10 x 10 x 10. The exponent is more succinct. When you get to a number such as 10100 then the exponent is much more succinct. But you could still write it out if you wanted to.
10000km can be written as 1.00 × 104 km
92 = 81
the answer is 6 cubed