Read the passage. (1) I think that schools should switch from using paper
textbooks to using computer tablets. (2) Textbooks
were effective in the pre-digital age, but now we live in
a technology-based society, so schools need to get
with the program and adopt a modern approach to
learning. (3) In fact, the chair of the Federal
Communications Commission said that "it's time for the
next stage" of learning with tablets and pointed out how
textbooks are often out of date. (4) Opponents argue
that tablets aren't a good choice because initially
they're very expensive. (5) The secretary of education
pointed out that tablets can be updated regularly, which
saves money in the long run. (6) Not to mention the
pluses of having the latest and greatest info! (7) Many
experts agree that switching to tablets is important for
the future of education.

It is given that 7 students are in the technical crew.

Let, the number of students in a group = x

Also, the rest of the students work in dance routines in groups of 9 i.e. total number of students in dance routines is 9x.

Thus, total number of students = 7 + 9x.

As, at least 6 groups are needed i.e. minimum number of students needed are 6×9 = 54.

This gives us the relation,

7 + 9x ≥ 54

i.e. 9x ≥ 54 - 7

i.e. 9x ≥ 47

i.e. x ≥ 5

Hence, the minimum number of students required are 5.

Explanation:

sentice 3

Explanation:

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.