Question

insira 12 meios aritmeticos entre 60 e - 5 ?????

Answer 1

P.A. an=a1+(n-1)r

a1=-5
a14=60

60=-5+13r
65/13=r
r=5

P.A.={-5; 0; 5; 10; 15; 20; 25; 30; 35; 40; 45; 50; 55; 60}

Answer 2

An = a₁ + (n - 1) * r

- 5 = 60 + (14 - 1) * r

- 5 = 60 + 13r

13r = - 5 - 60

13r = - 65

r = - 65/13

r = - 5

P.A. (60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, - 5).