Working alone, it would take Shandra 40 minutes to sand a table. To sand the same table, also working alone, it would take Kelly
2 answers:
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Check the picture below
area of a triangle is 1/2 bh
area of a triangle is 1/2 bh
If h moves the graph left or right, 
(moves left)
(moves right)
If a vertical stretch by a factor of |h|, then
If h moves the graph up or down,
(moves up)
(moves down)
and h = 1
If a vertical stretch by a factor of |h|, then
If h moves the graph up or down,
To the risk of sounding redundant,
and surely you'd know what that is.
and surely you'd know what that is.