Calcule a razão de uma P A ,em que a1=5 e a15=75

Calcule a razão de uma P A ,em que a1=5 e a15=75



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    A1 = 5
    a15 = 75
    r = ?
    n = 15

    Termo Geral de uma PA:

    an = a1 + (n- 1).r
    a15 = a1 + (15 — 1).r
    75 =5 + 14.r
    75 — 5 = 14r
    70 = 14r
    70/14 = r
    5 = r
    r = 5

    (razo = 5)

  • 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.
    a_ n=a_1+(n-1)*r a_1_5=a_1+(15-1)*r a_1_5=a_1+14r 75=5+14r 14r=70 r=frac{70}{14} boxed{r=5}

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− 7 = 2