A rationla power is a power in form a/b
remeber these 2 simple rules
1.
2.![x^\frac{m}{n}=\sqrt[n]{x^m}](https://tex.z-dn.net/?f=x%5E%5Cfrac%7Bm%7D%7Bn%7D%3D%5Csqrt%5Bn%5D%7Bx%5Em%7D)
and the combo of these
![x^\frac{-m}{n}=\frac{1}{\sqrt[n]{x^m}}](https://tex.z-dn.net/?f=x%5E%5Cfrac%7B-m%7D%7Bn%7D%3D%5Cfrac%7B1%7D%7B%5Csqrt%5Bn%5D%7Bx%5Em%7D%7D)
that's all
remeber these 2 simple rules
1.
2.
and the combo of these
that's all
Work out (7 × 10^3)x(2 x 10^7) Give your answer in standard form.
1 answer:
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Answer:
The answer is 4536.
Step-by-step explanation:
Each number is to consist of four different digits(no repetition) from 0 to 9, except that the first digit cannot be 0.
Total numerals from 0 to 9 = 10
For 1st place you have 9 options for 1st digit (0 is not selected here).
For the 2nd place you again have 9 numbers (0 is available but 1 digit less from 10 as it is already selected in first place) so, you get 9c1 ways = 9
For the 3rd place you have 8c1 ways = 8
For the 4th place you have 7c1 ways = 7
Total number of identification numbers are :
Therefore, there are 4536 different identification numbers.