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Find the rule for the sequence: Input (n): 1, 2, 3, 4. Output (Tn): 7, 9, 11, 13. Then find the 10th and 100th terms.

Mathematics

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Step-by-step solution

4 steps
  1. Determine the rule for the sequence.

    We are given the input and output values for :
    Input (nn): 1, 2, 3, 4
    Output (TnT_n): 7, 9, 11, 13

    First, find the common difference between consecutive output values:
    9−7=29 - 7 = 2
    11−9=211 - 9 = 2
    13−11=213 - 11 = 2
    The common difference is 2. This indicates a linear rule of the form Tn=an+bT_n = an + b, where aa is the common difference.
    So, a=2a = 2. The rule is Tn=2n+bT_n = 2n + b.

  2. Find the value of bb.

    Substitute one of the input-output pairs into the rule. Using n=1n=1 and T1=7T_1=7:

    7=2(1)+b7 = 2(1) + b 7=2+b7 = 2 + b b=7−2b = 7 - 2 b=5b = 5

    The rule for the sequence is Tn=2n+5T_n = 2n + 5.

  3. Calculate the missing output values using the rule Tn=2n+5T_n = 2n + 5.

    For Input n=10n=10:

    T10=2(10)+5=20+5=25T_{10} = 2(10) + 5 = 20 + 5 = 25

    For Input n=100n=100:

    T100=2(100)+5=200+5=205T_{100} = 2(100) + 5 = 200 + 5 = 205
  4. Complete the table and list the terms.

    The rule is: Tn=2n+5\boxed{T_n = 2n + 5}

    The completed table is:

    Input123410100
    Output79111325205

    The terms are:
    T1=7T_1 = \boxed{7}
    T2=9T_2 = \boxed{9}
    T3=11T_3 = \boxed{11}
    T4=13T_4 = \boxed{13}
    T10=25T_{10} = \boxed{25}
    T100=205T_{100} = \boxed{205}

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