Verified Answer :

Timanaku

Try and visualise it as a piece of pie, the usually helps

39)  
14x-(12x+y)
14x-12x-y
12x-y
40) d=5-2
41) 7+p=9
42) m=10
43) y=90x
44) 270   (90x3=270)
45) (4,80)  a point is expressed as (x,y)
46) Distance  (distance is dependent on the amount of time gone by)

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