Which term of sequence 20,19.25,18.5...is the first negetive term?
Answers
Answered by
1
20-0.75=19.25
19.25-075=18.50
18.50-0.75=17.75
Answered by
2
a=20
d=-0.5
a+(n-1)d <0
20+(n-1)-0.5 <0
20-0.5n +0.5 <0
20.5 -0.5n < 0
-0.5n < -20.5
n< -20.5/0.5
n< 41
n=42
Similar questions