Question

The value of $\left(2.3a^5{b}^2\right)\times \left(1.2a^2{b}^4\right)$, when $a=1$ and $b=0.5$ is ________.

• A. $0.011625$
• B. $0.043125$
• C. $0.031825$
• D. $0.041525$

Answer 1

The correct option is B $0.043125$

Given expression is $\left(2.3a^5{b}^2\right)\times \left(1.2a^2{b}^4\right)$$=2.76\times a^7{b}^6$

Also given $a=1,b=0.5$

Subtituting the values, we get

$2.76\times 1^7\times (0.5{)}^6$

$=2.76\times \left(0.015625\right)$

$=0.043125$