Arithmetic sequence for -1 -6 -11 -16 expression

hello :

note :

the nth term of an arithmetic sequence is :

An =A1+(n-1)d   a common difference is : d   ...   A1 :  the first term

in this exercice : A1 = - 1         d = (-6) -(- 1)  = -5

An = - 1 + (n - 1)(-5)

the expression is : An = - 5n +4

b) well because you get well

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