Are you as smart as you think?

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1 Is this correct? abcdefghjklmopqrstuwxyz
2 How many (added together) numbers are here? 15 6 9 8 5 6 4
3 Is this the correct way to use the word sell? I have gone through 3 sell phones this year.
4 Is this the correct way to spell this word? Mispell
5 What is a line graph's purpose?