I NEED HELP ON ALL QUESTIONS PLASEEE I HAVE THIS PAGE LEFT BUT I DONT UNDERSTAND THIS ONE AND ILL MARK BRAINSLIST AND ILL GIVE 40 POINTS

  2.  2n+1

  3.  n+3

  4.  see below for "reasoning"

Step-by-step explanation:

2.a. Stays the same: one light square; two columns of dark squares.

  Changes: the number of dark squares in a column.

2.b. The number of dark squares in a column is equal to the figure number, so the total number of squares is two times the figure number, plus one.

2.c. 2n+1

2.d. coefficient: 2; constant: 1

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3.a. (figure, triangles) = (1, 4), (2, 5), (3, 6), (4, 7), (5, 8)

3.b. The number of triangles is 3 more than the figure number.

3.c. n+3

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4.a. Seemingly, Anne is counting the number of squares above the corner (n), the corner square (1), and the number of squares to the right of the corner (n), for a total of n + 1 + n.

4.b. It appears that Sanjay is counting the number of squares above the bottom row (n) and the number in the bottom row (n+1), for a total of n + (n+1).

4.c. However Robert counts it, he realizes the simplified form of the expression can be 2n+1.