1. lesson 14.notebook September 17, 2012
Lesson 14:
*FYI...
Sometimes we use a letter to represent an unidentified
number.
expression­­> 5x
constant variable
or
coefficient
**To evaluate an expression...substitute numbers in place of the
variable(s) and calculate the result!
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2. lesson 14.notebook September 17, 2012
Examples ­ Lesson 14
A) A formula for the perimeter of a rectangle is P = 2l + 2w.
Find P when l is 15 cm and w is 12 cm.
B) In the expression 4ac, what is the constant?
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3. lesson 14.notebook September 17, 2012
C) Evaluate 4ac, when a = 1 and c = 12.
Solve each equation by inspection. Check your answer.
D) w + 5 = 16 check:
E) m ­ 6 = 18 check:
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4. lesson 14.notebook September 17, 2012
F) 25 ­ n = 11 check:
G) 5x = 30 check:
H) d = 8 check:
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5. lesson 14.notebook September 17, 2012
I) 12 = 6 check:
z
J) 2a ­ 1 = 9 check:
K) 20 = 3f ­ 1 check:
L) 2r + 3 = 15 check:
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