Multiply row 2 by 2, and insert it for row 2: -1
-7
4
-1
-4
-7
4
-2
8.
-4
1
6
3
-4
2 R2 R2
-2
30
8
-4
1
30

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

34.5 cm

step-by-step explanation:

generally for a circular segment of angle, θ° and radius r

arc length

= (θ/360) x circumference

= (θ/360) x 2πr

in our case, θ = 60°, π=3.142 and r = 33 cm

substitute into above formula

arc length

= (60/360) x 2(3.142)( 33) = 34.5 cm