Answer: 
Step-by-step explanation:
Given
It takes 20 min and 30 min for a person and his friend to paint a wall individually i.e.
In 1 min they cover
part and
part of wall respectively.
If the work together, 1 minute work is

Time required will be reciprocal of it

Answer:
the independent variable is the # of runners while the dependent is the # of water bottles
Step-by-step explanation:
C. Segment EB is a chord that lies on a secant because the line segment's endpoints are on the circle.