Answer:
less than
Step-by-step explanation:
He rowed 31.5 miles in half of an hour, to get speed per hour, you multiply by two.
31.5*2=63
Doug's average speed is 63 miles per hour~_~
Answer:
66
Step-by-step explanation:
Height of the cone having volume as
and base area
is 6 cm.
Solution:
Given that volume of cone = 
Area of base = 
Need to determine height of the cone.
Formula for volume of the cone is as follows

Area of circular base of cone = 
Replacing
in equation (1), we get



In our case Volume of cone
and Area of base 
On substituting the values of volume and area in equation 2 we get

Answer:
6.816. To check for reasonableness, you know that 0.96 is pretty close to 1, so since 6.816 is pretty close to 7.1, you know your answer is reasonable.
Step-by-step explanation: