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
In scientific notation it would be 1.640502 × 10^11
Answer:
-5x+7=-38
-5x=-45
x=9
Step-by-step explanation:
Answer:
i believe it is answer c
Step-by-step explanation:
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