Answer:
(A)
The answers will have the same value, beacuse both scientific notations have the same coefficient, 4.2 and 1.4. Also, if you mentally subtract the exponents of those powers, you would have the same exponent. So, equal coefficient and equal exponent will give the same result.
(B)
The value of each expression can be found by dividing coefficients and powers.
[tex]\frac{4.2 \times 10^{9} }{1.4 \times 10^{4} }=3 \times 10^{9-4} = 3 \times 10^{5}[/tex]
(C)
The value of each expression in standard form is
[tex]3 \times 10^{5}=300,000[/tex]
Remember that standard form refers to the number without the ten-power.
