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N
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W
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F
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k
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E
q
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F
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m
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F
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k
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4
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4
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I
I
Lesson
Practice
P
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b
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w
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h
p
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w
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F
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P
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P
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w
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E
q
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c
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(
m
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/
d
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D
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c
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m
a
l
p
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r
n
s
w
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h
t
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n
t
h
s
(
a
d
d
/
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b
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D
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c
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m
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s
p
a
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s
w
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h
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d
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d
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s
(
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d
/
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F
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c
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p
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w
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d
h
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d
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(
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P
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w
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d
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d
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d
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(
a
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C
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d
c
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t
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f
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c
t
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p
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(
a
d
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R
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v
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w
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f
w
h
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n
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b
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p
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W
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m
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(
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Finding the unknown (4 operations) II
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