book Maths Puzzle Numerical Ability

-3-(-12)=19 ?

9+6a=6a+9 ?

-3+7c<-17 ?

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book Other Question

If the length of a living room is 22 feet, what will that length measure in inches on a blueprint whose scale is 1/4 inch to the foot? please help me with this problem.

Plot the ordered triple in three- dimensional coordinate system. (plot points on the same graph)
(3,-4,2)