What exclusions are placed on the variable a for the fraction a^2 m+4m/a^2 +4?

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Over the last 4 seconds, a snail has traveled 4/9 of an inch. if the snail traveled the same distance each second, how far did it travel each second?

Of the total number of spectators at a circus show, 1/4 are men. 2/5 of the remaining number of spectators are women. there are 132 women at the circus show. how many children are at the circus show?