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OpenStudy (anonymous):
use compatible numbers to do this mentally! (+0.43) + (-1.8) + (+0.57) + (-0.2)
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OpenStudy (anonymous):
hows it 0
OpenStudy (anonymous):
ok but what are the compatible numbers
OpenStudy (anonymous):
haha whoops! -1! i'm sorry, -1.8 + (-0.2) = -2
OpenStudy (anonymous):
it says make them compatible numbers first
OpenStudy (anonymous):
the answer is -1. -1.8 + (-0.2) = -2 and 0.43 + 0.57 = 1, so -2 + 1 = -1. compatible numbers means numbers that fit together, which is why i arranged the equations the way i did.
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