The number of exports is GREATER than the number of imports if the bar for exports (pink) is TALLER than the bar for imports (blue). It appears that happens only on Friday.
1) 
2) 
is a right angle (perpendicular lines form right angles)
3) 
is a right triangle (definition of a right triangle)
4) 
and 
are complementary (the acute angles of a right triangle are complementary)
Answer:
Step-by-step explanation:
She is not making a valid inference because she only asked 22 students out of the entire school's population.
