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Alvin
Mathematics
13 October, 18:12
Solve for n.
0.4 (5 - 0.4n) = - 3.2
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Kareem
13 October, 18:18
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0.4 (5-0.4n) = - 3.2
Divide by 0.4 both sides
5-0.4n = - 3.2/0.4
Rearrange
-0.4n = - 3.2/0.4 - 5
Simplify
{-3.2/0.4 = - 32/4 [if you multiply and divide by 10] = - 8}
-0.4n = - 8-5 {8+5=13 and since both are negative don't forget the sign}
-0.4n=-13
n=13/0.4 {multiply and divide by 10 }
n=130/4 {130/2 = 65, 65/2 = 32.5 So 130/4=32.5}
n=32.5
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Larry Cantrell
13 October, 18:36
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Remember you can do anything to an equaiotn as long as you do it to both sides
also, negative/positive=negative so
0.4 (5-0.4n) = - 3.2
divide both sides by 0.4
5-0.4n=-8
subtract 5 from both sides
-0.4n=-13
divide both sides by - 0.4
n=32.5
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