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- #1

3, -1.5, 0.75, -375

x = a

a = 3

x

_{2, }= -1.5, x

_{3, }= 0.75, x

_{4}= -375...

x

_{2}= rx

_{1}+d

x

_{3}= rx

_{2}+d

-1.5 = 3r + d

0.75 = -1.5 + d

-1.5 - 0.75 = (3r + d) - (-1.5 + d)

r = - 0.5

Sub in equation (2)

d = -1.5 - 3r = -1.5 - 3(-0.5)

d = 0

x

_{4}= -0.5 x 0.75 + 0 = -0.375

Answer should be = -375

Anyone see where I am going wrong!

P.S. I will practice the new form latex here as soon as I can.