Seudónimo
Seudónimo
19-02-2016
Mathematics
contestada
(d+3d) - (-d+ 2) ; d = 3
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apologiabiology
apologiabiology
19-02-2016
what they want you to do is subsitute 3 for d write 3 for everywhere you see d and remember that 3d means 3 times d and -d means -1 times d (d+3d)-(-d+2) d=3 (3+3(3))-(-3+2) (3+9)-(2-3) (12)-(-1) 12+1 13 answer is 13
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