Dada a sequência(-19,-15,-11, ),podemos afirmar que:

Dada a sequência(-19,-15,-11, ),podemos afirmar que:



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    P.A.(-19, -15, -11,…)

    1- Errado.
    2- Correto.
    3- Errado.
    4- Correto.

    R) As alternativas 2 e 4 esto corretas.

    Justificaes

    1- A razo da P.A. +4.

    2- Resoluo:
    a1=-19
    n=6
    r=4
    a6= ?

    a6=a1+(n-1)r
    a6= -19+(6-1)4
    a6= -19+54
    a6= -19+20
    a6= 1

    3- Resoluo:
    a2-a4+a5= ?
    -15-(-7)+(-3)
    -15+7-3
    -18+7
    -11

    4- Resoluo:
    a1=-19
    n=20
    r=4
    a20=?

    A20=a1+(n-1)r
    A20=-19+(20-1)4
    A20=-19+194
    A20= -19+76
    A20= 57

  • Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
    1- errado, crescente, mas a razo +4

    2 — correto

    a_6=a_1+5r a_6=-19+5*4 a_6=-19+20 boxed{a_6=1}

    3 — errado, no caso, seria -15+7-3 = -11

    4 — correto

    a_2_0=a_1+19r a_2_0=-19+76 boxed{a_2_0=57}

    Portanto, corretas so 2 e 4.


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