Question

Which of the following expressions is not equal to 0.00055? 55 • 10-5 5.5 • 10-4 5.5 • 104 0.55 • 10-3

Answer 1

You can put each into standard form to see whether they have the right value.

5.5·10⁴ = 55,000 ≠ 0.00055

Answer 2

Answer:

(C)

Step-by-step explanation:

The given expression is :

$0.00055$

which on simplifying, we get

$\frac{55}{100000}=55{\times}10^{-5}$

The given expression can be easily rewritten as:

$5.5{\times}10^{-4}$ and $0.55{\times}10^{-3}$

but $5.5{\times}10^{4}=55000{\neq}0.00055$

Thus, Option (C) is the expression which is not equal to the given expression.