Chapter 11 - 11.2 - Arithmetic Sequences and Partial Sums - 11.2 Exercises - Page 786: 40

$a_1=-1$ $a_2=-0.25$ $a_3=0.5$ $a_4=1.25$ $a_5=2$

$a_3=0.5,~~a_{n+1}=a_n+0.75$ $a_3=a_2+0.75$ $0.5=a_2+0.75$ $a_2=0.5-0.75=-0.25$ $a_2=a_1+0.75$ $-0.25=a_1+0.75$ $a_1=-0.25-0.75=-1$ $a_4=a_3+0.75=0.5+0.75=1.25$ $a_5=a_4+0.75=1.25+0.75=2$