On Desk: Learning Log: HW: p. 98, #5, and SBA packet #7-11

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Presentation transcript:

On Desk: Learning Log: HW: p. 98, #5, 17-18 and SBA packet #7-11 Math CC7/8 – Be Prepared On Desk: Pencil Calculator Math Journal TwMM Learning Log Learning Log: HW: p. 98, #5, 17-18 and SBA packet #7-11 Parent Signatures? TwMM Test – FRI Quiz Retake – Thursday in class

Tasks for Today Warm Up – SBA Review Quick Quiz Parent sig. by Wednesday! Retake in class Thursday! Lesson 4.2– Older and Faster

Warm Up 1. Write the equation for a line through the points (2, -9) and (-2, 3). Show work. 2. Write the equation for a line with slope -3 and passing through the point (1, 4). Show work.

About = -1.25 -5 4 It is a negative slope, so as age increases by one year, race time decreases by 1.25 seconds

There is a reasonable linear trend, so we could probably predict a race time of close to 20 seconds.

Hmmm… Beyond 18 or so, running speed doesn’t increase much. Also, the rate of increase might slow since this data would predict a time of 6 or 7 seconds for age 20 – that’s better than the world record!

Answers vary… (10, 20) and (13, 17) don’t seem to fit the model. These indicate a slower than expected running speed – race time is longer than predicted by the trend line.

No… The point for this player would lie above the line s = h because his arm span is greater than his height.

1. Are age and GPA strongly related for these students? Explain. No, the scatter plot does not show a strong relationship between these variables - the scatter is NOT clustered along a line. 2. How is your answer supported by the table? By the scatter plot? Table – high and low GPAs, all ages Graph – No linear trend