Not using a calculator(use if you want), Find The Answer For...
a)a+a
b)1000000x43234322342423423423-23442323x0+4242342378942374947826478264237846247236482634826
c)1+1x1+1-3+5-6-3+-5+-4+-3+2-4+2 (Tehehehehe!~!~#$@$@$@)

THE FIRST PERSON TO LEAVE ALL 3 ANSWERS AT THE TAGBOARD WILL GET YOUR NAME IN PRO! example"
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---LAMER is a PRO!!!---
CoNgRaTuLaTiOnS LAMER on answering the 3 SIMPLE questions :D!~~~~~~~~~~~~~~~~~~~~
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Hint For ALL 3 Answers! shhhh!!! The Hint Is -100000000000000000000000000000000000000000000000000 TO 100000000000000000000000000000000000000000000000
For The Algebra Question Hint Is a-100000000000000000000000000000a :D have fun!!!