solve the following problem
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Answer:
10 : 9x+9y
11 : 121 a -121 b
For solution of 12 and 13 refer above pictures
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10) 9 ( x + y )
= 9x + 9y
11) 121 ( a - b )
= 121a - 121b
12) ( 4 - x ) ( 5 - y )
= 4 ( 5 - y ) - x ( 5 - y )
= 20 - 4y - 5x - xy
13) ( 9 + y ) ( 10 - x )
= 9 ( 10 - x ) + y ( 10 - x )
= 90 - 9x + 10y - xy
I hope this will be help you
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