Question

the algebric expression of an arithmetic sequence is 4n-3. a, what is the 30th term. b, find the sum of first 59 terms ​

Answer 1

Answer:

Step-by-step explanation:

Given,

Expression = 4n - 3

a. The 30th term

Here in the given question, we substitute 30 in place of n:

a30 = 4(30) - 3

       = 120 - 3

       = 117

b. Sum of first 59 terms

Here, we can use the formula S = n/2(a + l)

a1 = 4(1) - 3

   = 4 - 3 = 1

a59 = 4(59) - 3

       = 236 - 3 = 233

Sum of the first 59 terms = 59/2 * (1 + 233)

59/2 * 234 = 6903

a. 117 b.6903

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