That's easy 172.1 times 10 with the exponent of 7
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Hello there,
From Point A to Point B Peter traveled roughly 30 miles in 30 minutes.
From Point B to Point C Peter traveled roughly 130 miles in 2 hours and 30 minutes.
From Point C he didn't move in distance but the hours moved so c is out.
From Point C to Point D, Peter traveled roughly 180 miles in 3 hours.
Therefore D Peter had the fastest interval at D.
20,000 Hz = 2 × 10^4 Hz
150,000 Hz = 1.5 × 10^5 Hz
These Are Less Than(<) and Greater Than(>) Symbols!!
Hope This Helps!!!