SOLUTION: 25. World Records in the 1500-m run. The formula R = 0.075t +3.85 Can be used to predict the world record in the 1500-m run t years after 1930. Determine (in term

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Question 56899: 25. World Records in the 1500-m run. The formula
R = 0.075t +3.85
Can be used to predict the world record in the 1500-m run t years after 1930. Determine (in terms of an inequality) those years for which the world record will be less than 3.5 min.
49. Electrical Visits. Dot's electric made 17 customer calls last week and 22 calls this week. How many calls must be made next week in order to maintain an average of at least 20 for the three week period?
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
R = 0.075t +3.85
Can be used to predict the world record in the 1500-m run t years after 1930. Determine (in terms of an inequality) those years for which the world record will be less than 3.5 min.
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0.75t+3.85<3.5
0.75t<-0.35
t<-0.467
This doesn't make any sense.
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49. Electrical Visits. Dot's electric made 17 customer calls last week and 22 calls this week. How many calls must be made next week in order to maintain an average of at least 20 for the three week period?
Let "x" be the number of calls next week.
INEQUALITY:
(17+22+x)/3>=20
17+22+x>=60
x>=21
Cheers,
Stan H.