Thursday, November 4, 2010

Kathleen's Scribepost for November 4, 2010

Question #12

A pelican dives vertically from a height of 3.8 m above the water. It then catches a fish 2.3 m underwater.
a) Write an expression using rational numbers to represent the length of the pelican's dive.

b) How long is the pelican's dive?

a) Answer will be a rational number or integer cause the question asked to write an expression using rational number.
3.8 - (-2.3)
3.8 is positive because it's above water and -2.3 is negative because the pelican went descending.

The answer is a positive because the subtrahend is much bigger than the minuend.

b) The pelican's dive is about 6.1 meters long.

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