Answer:
-2497
Step-by-step explanation:
Sn=n/2[2a+(n-1)d]
=22/2[2*-40+(22-1)d]
=11(2*-40+(21*-7)
= -2497
I got 70
Combination=n!/((n-r)!r!)
=8!/((8-4)!*4!)
=8*7*6*5*4!/(4!*4!)
=8*7*6*5/(4*3*2)
=70 ways
3×-1= -3 if u put it the other way it would will still be -3
The correct answer is C) <span>(2, -3/400) Hope this helps!!!!</span>
23/103 = 0.22
0.22*100 = 22%
The percentage increase is 22%
Hope that helps!