Answer:
Step-by-step explanation:
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1/5+1/7=12/35 of one room painted per hour
1 room/(12/35)=35/12 hours per room working together
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Try solving for the variable and get everything to one side
So 3 times a number is between -18 and 18
between means it cannot be -18 or 18 so
3 times x=3x
x=unknown
3x
< less than
>greater than
if it is between -18 and 18 then the number is >-18 and <18 so
-18<3x and
18>3x
divide both equations by 3
-6<x
6>x
combine
-6<x<6
solution set=(x|-6<x<6)