Question

quanto vale o 14 termo da p.a (5,10,15.....)​

Answer 1

aₙ=a₁+(n-1)*r

r=10-5=15-10=5

a₁ =5

n=14

a₁₄=5+(14-1)*5 = 70

Answer 2

$A1 = 5$ | $r = A2 - A1$ => $r = 10 - 5$ => $r = 5$

$An = a1 + (n - 1) \times r$

$A14 = 5 + (14 - 1) \times 5$

$A14 = 5 \: + \: 13 \: \times \: 5$

$A14 = 5 + 65$

$A14 = 70$