Can somebody please help me with these two problems?
1. What is the sum of the finite arithmetic series? 26 + 29 + 32 + 35 + 38 + 41 + 44
2. What is the sum of the finite arithmetic series? 7.6 + 6.3 + 5 + 3.7 + 2.4 + 1.1 + (–0.2) + (–1.5),
The formula for sum of AP is S = [2a + (n - 1)d]*n/2
where a is first term of series, n is number of terms and d is the difference
1. here a=26, n=7 and d= 29-26=3
so S = [2*26 + (7 - 1)*3]*7/2
S=245
2. here a=7.6, n=8 and d= 6.3-7.6=-1.3
so S = [2*7.6 + (8 - 1)*-1.3]*8/2
S=24.4
