Step-by-step explanation:
Sn=n/2(2a+(n-1)d). n=20
S20= 20/2 (2x5+(20-1)3 a=5
S20=10(10+57). d=8-5=3
S20=10x67
S20= 670
Hope this helps you
have a great day
5) associative
6)commutative
7) multiplicative identity
8) Distributive
You do the difference divided by the starting number.
518 - 422 = 96 (the difference)
422 is the starting number.
96/422 = 0.227488 (rounded up)
if 1 is 100% then 1+0.2227488 would be the increase.
1 + 0.227488 = 1.227488
1.227 = 122.7%
I think so:
Your working out is probably just the same as my working out!
The answer itss b= 41.5 units
