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© 2014 Pacific Crest
87
M
odel(s)
Exemplars and representations
U
sing
a
F
ormula
The formula for distance in terms
of rate and time is:
d
=
r
•
t
.
We can find the value of
d
if
miles
30
hour
r
=
and
t
= 2
hours
.
(
)
miles
30
2 hours
hour
miles
miles
60
hours 60
hour
hour
d r t
d
d
=
=
=
=
hours
1
60 miles
d
=
C
ritical Thinking Questions
Developing your understanding
1. In what order do you perform the steps when you use the Order of Operations?
2. Which step in the Order of Operations do you find the most difficult to carry out? Why?
3. What is the purpose of the Order of Operations?
4. How is the fraction bar like parentheses?
5. When evaluating an expression and substituting in specific values for variables, how do you ensure
that the values are substituted in correctly?
2.3 Evaluating a Formula