MODELING WITH MATHEMATICS In 1960, the world record for the men's mile was 3.91 minutes. In 1980, the record time was 3.81 minutes. a. Write a linear model that represents the world record (in minutes) for the men's mile as a function of the number of years, t. since 1960.
y =
b. Use the model to estimate the record time in 2000 and predict the record time in 2020,
2000:
minutes
2020:
minutes

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

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X2 + y 2 = 36 x + y = 6 solve the system of equations.