Question

The exponent $(?)$ to the base $10$ for $7.2\times {10}^{?}=72$ is
.

• A. $0$
• B. $1$
• C. $2$

Answer 1

The correct option is B $1$

$\underset{–}{\text{Need to find:}}$ The exponent $(?)$ in $7.2\times {10}^{?}=72$

We know that multiplying $7.2$ by $10$ is responsible to move the decimal point $1$ unit to the right, i.e., $7.2\times 10=72.0=72$.

$\therefore 7.2\times {10}^1=72$

Hence, the exponent $(?)$ in $7.2\times {10}^{?}=72$ is $\underset{–}{1}$.