Question

Compare the following numbers ÷
(a) 1.8 x 10^15: 1.5 x 10^20​​

Answer 1

refer to the attachment

Answer 2

Answer:

$1.8 * 10^{15}$  is $(1.2).10^{-5}$  times of $1.5 * 10^{20}$

Step-by-step explanation:

$1.8 * 10^{15} : 1.5 * 10^{20}$

$=\frac{1.8 * 10^{15}}{1.5 * 10^{20}}$

$=\frac{18 * 10^{14}}{15 * 10^{19}}$

$=\frac{6 * 10^{14}}{5 * 10^{19}}$

$=(1.2).\frac{10^{14}}{10^{19}}$

$=(1.2).10^{14-19}$  [∵ $\frac{a^m}{a^n} = a^{m-n}$]

$=(1.2).10^{-5}$

∴ $1.8 * 10^{15}$  is $(1.2).10^{-5}$  times of $1.5 * 10^{20}$