In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Q: Problem: find value for x from below equation ? x + 1 = 4 
Options: a ) - 5 , b ) - 4 , c ) 4 , d ) 3 , e ) 2

A: d
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Q: Problem: if x / 4 years ago roger was 14 years old and x / 4 years from now he will be 4 x years old , how old will he be 6 x years from now ? 
Options: a ) 32 , b ) 39 , c ) 30 , d ) 40 , e ) 28

A: b
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Q: Problem: find the value for m ? 21 ( m + n ) + 21 = 21 ( - m + n ) + 21 
Options: a ) 0 , b ) - 1 , c ) 1 , d ) 2 , e ) 3

A:
c
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