what should be added to -200 to get ( 10-250) ?

what should be subtracted from -400 to get 75 ?

Dear Student,


$$\begin{gathered} a) we are considering 10-250 to be the range in which the result is desired \\ So, Let x is required to add to-200 to get (10-250) \\ \Rightarrow -200+x=10 (taking lower limit) \\ \Rightarrow x=200+10 \\ \Rightarrow x=210 \\ Now, \\ \Rightarrow -200+x=250 (taking upper limit) \\ \Rightarrow x=250+200 \\ \Rightarrow x=450 \\ so, If we add (210-450) to -200 we get (10-250\left) \\ b\right)Let y is required to subtract from -400 to get 75 \\ \Rightarrow -400-y=75 \\ \Rightarrow -y=75+400 \\ \Rightarrow -y=475 \\ \Rightarrow y=-475 \\ So, if we subtract -475 from -400 we get 75. \end{gathered}$$
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