No, 3/4 is equivalent to 6/8 and 7/8 is in its final form
length=8 cm, width=6 cm, height=5 cm. (answer = 2.1 g/cm3)
For this case we have that by definition, the equation of a line in the point-slope form is given by:

Where:
m: It is the slope of the line and
is a point through which the line passes.
We have the following equation of the slope-intersection form:

Where the slope is 
By definition, if two lines are perpendicular then the product of their slopes is -1.
Thus, a perpendicular line will have a slope:

Thus, the equation will be of the form:

Finally we substitute the given point and we have:

Answer:
Option B
Answer:
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