Answer:
D.
Step-by-step explanation:
After the third step, take the square root of both sides.
Third Step:
Thus, the fourth step is:
The left side cancels:
If 3 students walked, then according to the given ratios, 18 students would have taken the bus.
Given: 3 Walkers
1:2 --> 3:6 walkers to subway
1:3 --> 6:18 subway to bus riders
Area of semicircle =( π r2)÷ 2
= 1/2 × 22/7 × 11 ×11
= 11 × 17.5
= 19.25 CM2