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<h3>
Answer: Bottom left corner (southwest corner)</h3>

The left endpoint is x = 4, but we don't include this endpoint because of the open hole. We use a parenthesis to indicate "don't include the endpoint"
The right endpoint is positive infinity. We always use a parenthesis with either infinity since we cannot reach infinity
The interval from 4 to infinity is written as
which is like saying 
Answer:
x = 1/4 k
Step-by-step explanation:
11kx + 13kx = 6
(11k+13k)x = 6
24kx = 6
x = k/4