Answer this multiple choice question correctly for 30 points and

  C.  6x² -2x -1

Step-by-step explanation:

You want the sum of ...

  (5x² -8x +2) + (2x² -3x -7) - (x² -9x -4)

Eliminating parentheses gives ...

  5x² -8x +2 +2x² -3x -7 -x² +9x +4

Grouping like terms, we have ...

  (5x² +2x² -x²) + (-8x -3x +9x) + (2 -7 +4)

Then combining like terms gives ...

  6x² -2x -1 . . . . matches choice C

10010010001010010101001001010010100101010010101010010010101010110010001011010010010001

step-by-step explanation:

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.