Answer:
11x-15
Step-by-step explanation:
4x-8+7x-7
11x-15
This is not my work but i hope this can help you with your problem
https://answers.yahoo.com/question/index?qid=20120518194118AAhi738
Becouse k and n are 'neighbours' so their sum are 180
so k=180-42=138
Answer:
66 squares are in the circle.