For this case we must find an expression equivalent to:

By definition of power properties we have to:

So, rewriting the expression we have:


By definition of multiplication of powers of the same base, we put the same base and add the exponents:

Answer:
Option B
Given :


Now, Substituing the value of y in equation (ii) :








Now, substituting the value of x in equation (i) :




Answer:
2.7930 × 
Step-by-step explanation:
1.9 × 105 × 140 = 27,930
Scientific notation: 2.7930 × 