the formula r= -0.075t + 3.85 can be used to predict the world record for the 1500 meter run, t years after 1930.find an inequality that identifies the years in which the world record will be less than 2.8 minutes
If we ignore the total silliness of the question
-0.075t+3.85 < 2.8
t > 14 , where t is added to 1930
(As you can see below in the "related questions" this same question has been posted several times)
To find the years in which the world record will be less than 2.8 minutes, we can substitute 2.8 for r (the world record time) in the given formula and solve for t (the number of years after 1930).
The formula is:
r = -0.075t + 3.85
Substituting r = 2.8, we have:
2.8 = -0.075t + 3.85
To isolate t, we can subtract 3.85 from both sides:
2.8 - 3.85 = -0.075t
Simplifying:
-1.05 = -0.075t
To solve for t, we can divide both sides by -0.075:
t = -1.05 / -0.075
Calculating this expression gives us:
t = 14
Therefore, the years in which the world record will be less than 2.8 minutes are t years after 1930, where t is any value greater than 14.
Inequality: t > 14