Answer:
A
Step-by-step explanation:
Any rational expression where the denominator is zero is undefined.
The only expression where the denominator is zero is A 
A statement that defines who you are as a professional and what you hope to
keeping in mind that perpendicular lines have negative reciprocal slopes, let's check for the slope of the equation above

so a line perpendicular to that one above will have a slope of

Answer:
C
Step-by-step explanation:
Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock.