Answer:
5400
Explanation:
Convert 5.4 ⋅ 103 to standard form.

for 10^3 we add 3 zeros
10^3= 10 times 10 times 10=1000

Replace 10^3 by 1000. then multiply with the decimal number

When we multiply by 1000 we move the decimal point 3 places to the right
5400