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: a straight line in the xy - plane has y - intercept of 49 . on this line the x - coordinate of the point is 71 and y - coordinate is 12 then what is the slope of the line ?
Options: a ) 0.5 , b ) 0.51 , c ) - 0.52 , d ) 0.31 , e ) - 0.49
[A]: c

[Q]: Problem: if 213 16 = 3408 , then 16 21.3 is equal to :
Options: a ) 0.3408 , b ) 3.408 , c ) 34.08 , d ) 340.8 , e ) none of these
[A]: d

[Q]: Problem: what least value should be replaced by * in 223431 * so the number become divisible by 5
Options: a ) 0 , b ) 4 , c ) 5 , d ) 6 , e ) 7
[A]:
a