C. Find the common difference and the indicated term.
10) 17, 11, 5, -1, ... Find a39
11) 5, -5, -15, -25, ... Find a20
12) -40, -47, --54, -61, ... Find a29
13) -32, -132, -232, -332, ... Find a 40
14) -8, 22, 52, 82, ... Find a2o
15) 29, 38, 47, 56, ... Find a 29
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Answer:
1. d=-6, 39th term=-211
2. d=-10, 20th term= -185
3. d=-7, 29th term=-236
4. d=-100, 40th term= -3932
5. d=30, 20th term= 562
6. d=9, 29th term =281
Step-by-step explanation:
arithmetic formula
an=a1+(n-1)d
1. common difference(d) = 11-17=-6
first term(a1)=17
nth term(n)=39
an=17+(39-1)(6)
an=-221
2-6. same solution in 1