Evaluating Expressions

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Evaluating Expressions

• Example Evaluate 2/3 x 100 when x
  16.5

• Example Evaluate 5/(8x) when x 2.
• Is 5/8x the same expression? Evaluate and see if
  you obtain the same answer for x 2.
• Moral of story using ( ) makes it clear what
  you mean to others and your calculator!

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• Practice Evaluate the following expressions
• if x 4, m 5, and p -2
• X m - p
• m2
• p/x
• 4y3z if y -2 and z 10
• -x - -a if x 2, a -4, and b -6
• x - y x if x -2, y 3, and a - 4

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Suppose you want to evaluate a formula V ? r2
h if the radius of a right cylinder is 12.5
inches and the height is 18 inches. You would
store the values for r and h just like the above
example and then type the formula on the home
screen. Suppose you were comparing the volume of
two right cylinders and the other cylinder had a
radius of 18 inches and a height of 12.5 inches.
Simply store the new values for r and h, but in
stead of retyping the formula use the replay
feature e
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Using Variables
  Example 47 102  Assign
the box an alphabetical letter such as X.
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Classwork/Homework Classzone.com worksheet Pg 5
2-40 even