Answer:
1. Let n represents the number of weeks she needs to make at least 28 costumes,
Since, she can make 4 costumes each week,
i.e. In number line closed circle on 7 and shaded right from 7.
2. If the maximum time taken by her is 10 weeks,
⇒ n ≤ 10 ----(2),
From equation (1) and (2),
I.e. closed circle on both 7 and 10 and shaded right from 7 and shaded left from 10.
