Question

COMPLETE OS ESPAÇOS: (APRESENTE OS CÁLCULOS DA MÉDIA E RAZÃO)
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Answer 1

1)

$a_{4}=a_{2}+2r$

$11=-7+2r$

$2r=11+7$

$2r=18$

$r=\frac{18}{2}$

$r=9$

(-16,-7, 2, 11,20)

2)

$a_{4}=a_{2}+2r$

$15=-3+2r\\ 2r=15+3\\ 2r=18 \\r=\frac{18}{2}$

$r=9$

( -12,-3,6,15,24)

3)

$a_{4}=a_{2}+2r$

$-9=-3+2r\\2r=3-9\\2r=-6\\r=-\frac{6}{2}$

$r=-3$

PA (0, -3,-6, -9,-12)

4)

$a_{4}=a_{2}+2r$

$-8=-2+2r\\2r=2-8\\2r=-6\\r=-\frac{6}{2}$

$r=-3$

PA ( 1, -2,-5, -8,-11)

5)

$a_{4}=a_{2}+2r$

$-8=12+2r\\2r=-8-12\\2r=-20\\r=-\frac{20}{2}$

$r=-10$

PA ( 22, 12,2, -8,-18)