196k views
4 votes
Problem

A knitting pattern for a shawl calls for 8

stitches in the first row. Each row after that

has 2 more stitches than the previous row.

The explicit rule ax = 8 + (k − 1)2 gives the

number of stitches in the nth row row.

User BugBurger
by
8.6k points

2 Answers

0 votes

Answer:

1st question: C

2nd : 8

3rd : 46

4th : 540

User Aslam Patel
by
7.9k points
2 votes

Answer:

The n row has
2n+6 stitches.

Explanation:

The given expression is


a_(k)=8+(k-1)2

Where
d=2 and
a_(1)=8.

The number of stitches in the n row are expressed as


a_(n) =8+2n-2\\a_(n) =2n+6

Therefore, the n row has
2n+6 stitches.

Notice that the result is an expression, that is beacuse the problem is asking for a general solution, it's asking for the n row, which refers to certain row in general terms.

User Ivo Bosticky
by
9.0k points
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