Answers

2016-07-05T20:51:29+08:00
-5, __, 9 a1, a2, a3 formula a3=a1+ (n-1)d 9=-5 + (3-1)d 9=-5+(2)d 9+5=2d 14=2d 14/2=2d/2 (divide 2 to cancel the 2 in the d) 7=d d=7 -5 +7=2 2+7= 9 -5, 2, 9
1 5 1
yeah. i got it! ;-)
your welcome...
This solution (by Jobantola) is actually more correct than the the other user.
allright!
correction: "more correct than the other user's answer..."