Question

calcule o décimo quarto termo da P A :(4 ,8,12 16...)

Answer 1

an=a1+(n-1)r

a10=a1+9r

a10=4+9.4

a10=40

Answer 2

PA= (4,8,12,16,20,24,28,32,36,40,44,48,52,56)

Pn=a1+(n-1)*r

r=razão= 4

P14=4+(14-1)*r

P14=4+13*4

P14=4+52

P14=56