It is belived that about of our dreams involve people that we know.
a.
Write an expression to describe the number of dreams that feature people :
The number of dreams known is .
(Substitute )
The expression is .
b.
Find the number of dreams include people know out of dreams:
(Substitute )
()
(Multiply)
Therefore, the number of dreams that include people know dreams out of dream is dreams.
a. The expression is .
b. The number of dreams that include people know dreams out of dream is dreams.
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