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'.

Problem: 48.95 - 32.006 = ? 
Options: a ) 16.089 , b ) 16.35 , c ) 16.89 , d ) 16.944 , e ) none of them
d

Problem: how many positive integers less than 100 have a remainder of 6 when divided by 13 ? 
Options: a ) 2 , b ) 7 , c ) 6 , d ) 9 , e ) 10
c

Problem: if ( x + 1 ) ( x + 3 ) = x ^ 2 + x , what is a possible value of x ? 
Options: a ) 2 , b ) 3 , c ) - 1 / 3 , d ) - 3 , e ) - 1

e