anyone pls solve this all problems pls pls don't spam....! pls pls I'm very poor in maths pls ♥
Attachments:
Answers
Answered by
0
Sn=n/2(2a+(n-1)d)
a=1.4. ,. d=3.7-1.4=2.3,. and n =n
Sn=n/2(2*1.4+(n-1)2.3)
=n/2(2.8+2.3n-2.3)
=n/2(2.8-2.3+2.3n)
=n/2(0.5-2.3n)
=(0.5n/2)-(2.3n²/2)
=0.25n-1.15n²
Similar questions