HELP! i

the circumference of Terry's wheel is 250 centimeters. Estimate, to 1 significant figure, how many times the wheel goes round when Terry cylces 10 kilometers

$\begin{array}{|rcll|} \hline && \frac{10\ 000\ m}{2.50\ m} \\\\ &=& 4000 \\\\ &=& 4\cdot 10^3 \\\\ \hline \end{array}$

The wheel goes round 4000 times.

10 km =10,000 meters x 100 cm =1,000,000 cm

1,000,000 / 250 =4,000 number of times the wheel goes around.