yes it is. the reason for this is that there is no point to put in an extra zero (0.40), so people just say 0.4
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40%: = 40/100 or 2/5 in fractionTo get the equivalent fraction of 40%, multiply 2/5 by 2/2, 3/3, 4/4, ...Equivalent fractions of 40%= 4/10, 6/15, 8/20,...
x2+6x-40 = 0 (x+10)(x-4) = 0 x = 4 or x = -10
Yes.
40/210 is one.
Its (-4, 0) and (4, 2) not (40) and (42)