Answer:
Step-by-step explanation:
the sum: S of arithmetic sequence when the common difference is : d
d= 24-29 = 29-34 =34-39 = 39-44 = -5
S= n/2(A1 + A23)
An =A1+(n-1)d ....A1 = 44 n = 23
S= 23/2(44 -66 ) .... A23 = 44 +(23-1)(-5) = 44 +22×(-5) =44 - 110 = - 66
S= (23/2)(-22) =23×(-11) = - 253 ...... answer : A
