Answer:
60 minutes including the 15 minute rest.
Step-by-step explanation:
450/10 is 45. Therefore, biking for 45 minutes will loose 450 calories, 10 calories per minute. Maybe half way during the 45 minutes Spencer will take the 15 minute rest. This brings the biking trip 60 minutes.
Answer: 
<u>Step-by-step explanation:</u>

It is an infinite number of solutions. To put it simply, is x = 1, y would equal 4.you can do this with every single number.
Answer:
the answer is 1 over 8 , 1/8
Answer:
- increase the sample size
- choose students from different grade levels
- choose every fourth student in all language arts classes
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