Rates

#$&*

course Mth 277

6/8 at 1:15 pm

Question 1: ***If I make $50 in 5 hours then I am making $10/hour. \50/5=10

Confidence:3

Question 3: ***If I make $60,000 a year then I am making $5,000 per month.

60/12=5

Confidence=3

Question 4: ***It would make more sense to say that the small business makes an average of $5,000 per month because they are never going to make a flat rate every single month. Each month fluctuates based on business.

Confidence:3

Question 5: ***If I go 300 miles in 6 hours then I am traveling an average of 50 miles each hour. We say hour because the speed limit changes and so do traffic patterns. You may go 45 one hour and 55 another but the average between the two is 50.

Confidence:3

Question 6: ***If 60 gallons of gas are used on a 1200 mile trip, then you are using a gallon for every 20 miles.

20mpg*60 gallons=1200 miles

Confidence:3

Question 7: ***We are calculating average rates even though we are not adding anything and dividing because the rate is not absolutely constant all the time. The rate has dependent factors such as the type of vehicle driven, how the driver operates the vehicle, the traffic patterns faced, the different speed limits and types of roads traveled. The answer is not always constant and the rate is an average of what can be expected instead.

Confidence:3

Question 8: ***15 pounds more/40 push ups each day more= 0.375 pounds/push up for the second group

Confidence:2 because I think it is supposed to be a more complex problem than this

OK!

Question 9: ***17 lifting pounds more/20 more pounds added= 0.85 lifted pounds/added pounds so for each pound added, there was 0.85 more pounds lifted.

Confidence:2 because I think I did the math right after much reasoning and figuring out the units of what the conclusion should be, but it is a very confusing problem when comparing it to #8.

OK!

Question 10: ***It took him 10 seconds to go the 100 meters so every second he was running 10 meters/second.

Confidence:3

Question 11: ***With the information given and assuming he is going to keep the same pace, the simplest way to do this is to average the two times that he has run so far. This means he would complete the remaining 100 meters at 9.5 meters/second. To find what the question is asking, the amount of time that last 100 meters would take is 100 meters/9.5 meters/second which is 10.52 seconds.

Confidence:3

Question 12: ***For the last question, we found the average by adding the two times and dividing by two. This is acceptable for this problem because we were given two rates and we are only looking for one in order to determine the time. We needed the average rate and since we were given two we added them and divided by two for the time it would take depending on the average rate. It all depends on the nature of the problem.

Confidence:3

Question 13: ***The volume increases by 2000 cm^3 and the depth of the water changes by 4 cm. For every 1 cm, the volume was increasing by 500 cm^3. So the rate is 500 cm^3 for each cm.

Confidence: 3

OK"