Q&A #2532

Teachers' Lounge Discussion: Graphing Calculator use in Algebra 1

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From: Rich Wyllie

To: Teacher2Teacher Public Discussion
Date: 1999111515:36:07
Subject: testing with & w/o calculator

An interesting problem to be done both with and without a graphing calculator: A cold front came thru the other nite here in the midwest. From midnight one nite to midnight the other, the temperature, T (in deg F) was T = -.25x^2 + 5x + 50, where x is the hour on a 24 hour clock, x = 0 being midnight the first night. a. What were the midnight temperatures? b. What was the temperature at noon? c. How many hours was the temperature above 50? d. Sketch the graph of the midnight to midnight temps. With the calculator, answer the questions above plus: e. When was the maximum temperature reached? f. What was the maximum temperature reached? g. When was the minimum temperature reached? h. What was the minimum temperature reached?

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