Simply it as follows:
1 + 39 = 40
2 + 38 = 40 etc
18 + 22 = 40
19 + 21 = 40
There are 19 of these plus 40 itself . . .therefore 20 of them
20 x 40 = 800
And finally the last number not used, 20
Therefore 800 + 20 = 820
Answer:
y-4=0
Step-by-step explanation:
its the only that doesn't have a x?
Answer:
a formula that defines each term of a sequence using preceding terms
Step-by-step explanation:
gogle
Answer:
No solution
Step-by-step explanation:
Muah ha ha ha ha ha ha
Answer:
2n+22
Step-by-step explanation:
(n+11)2=
2n+22