Math CC 78 Be Prepared On Desk Turn

Math CC 7/8 – Be Prepared On Desk: Turn In: SP Test (late) In Your Planner: Thinking With Mathematical Models Journal: 1) Date: 4/25/2019 2) Title: Tw. MM 3. 2 cont. 3) Check off neighbor’s HW (p. 70 #4 -8) 4) WARM-UP: SBA REVIEW (Solve in your journal!) 1. HW: Tw. MM p. 74, #27, 29 -30, 42 a-c 2. Samples & Populations Retake Test is Friday, 4/26.

Tasks for Today • Warm Up – SBA Review • Finish Lesson 3. 2 B, C – Distance, Speed & Time • Quick Quiz (about 15 min. )

Warm Up 7 complete costumes 50. 24 cubic cm

What do you notice? As average speed increases, travel time decreases at a decreasing rate.

t= 300 s or st = 300 or s= 300 t

In the graph of the (s, t) data the curve drops rapidly at first and then more slowly, indicating that equal increases in speed for the trip (mph) have greater effect when the starting speed is low. A 5 mph increase from 30 to 35 is a much more significant increase than from 60 to 65.

Yes, the relationship between travel time and average speed is an inverse variation because the product of time and speed is constant in this situation.

The constant rate of change is 50 mi/h. This is a linear pattern. (straight line on graph) As x (time) increases by 1, y (distance) increases by 50 miles. d = 50 t

The (time, distance) relationship has a straight line graph and an equation of the form y = mx, so it is NOT an inverse variation.

Quick Quiz: Work QUIETLY on your own. Correct yours when you’re finished. Turn it in! Begin CW/HW p. 74, #27, 29 -30, 42 a-c After the Quick Quiz you may work on the CW/HW together (What should the room look like? )