Find next two terms in sequence, identify pattern:

-7, 9, -11, 13, -15

17 and -19

Step-by-step explanation:

-7, 9, -11, 13, -15...

Next two terms of 1st difference are : 17 and -19.

Without the operation signs (eg: +,-...) they are going up in two.

It goes negative, then positive and so on.

By using this, I am able to work out the next two terms.

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