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MsP

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Signed numbers are numbers which can be either positive or negative.
Don't be scared by word problems...just take what you know and plug it into an equation. Twice as long for history as psych, so psych will be X and history will be 2X. You know the total is 12 hours, therefore the equation will be 2X + X = 12. Combine like
Malathion is a pesticide that can affect the nervous system if ingested (often via groundwater)
Set it up like a proportion 200 yds 40 yds ------- = ------ $1.95 x Mutiply top to bottom then divide by your other number 1.95 x 40 = 78 then 78 divided by 200 = $ .39
This looks to me like a fraction. The numerator would be 36+9 and the denominator would be 3x5. The answer would be 45 / 15, which is really just a division problem 45 divided by 15 which would give you an answer of 3.

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