Question

Nexus and Nellie went to buy records for their gramophone. Nexus had $\$10$ to spend, and Nellie had ten times as much as Nexus to spend. Express the amount of money Nellie had as a power of $10$.

• A. $\${10}^3$
• B. $\${10}^2$
• C. $\$10$
• D. $\${10}^4$

Answer 1

The correct option is B $\${10}^2$

Nexus had $\$10$ to spend.
Nellie had $10$ times as much as Nexus to spend.

$\therefore$ Nellie had $=10\times \$10=\$100=\${10}^2$

$\underset{–}{\text{Note:}}$ In $100$, the number of zeros after $1$ is $2$. So, if we convert $100$ in exponent form, the exponent should be $2$, i.e., $100={10}^2$.

Hence, option (b.) is the correct one.