When you subtract 4 from 8 you get 4 and this when you add 9 your final answer is 13.
C. As the inequality is less than therefore x can be any number below 250, but cannot include 250 therefore must be fewer
you can use long division to do this:-
a + 3 ) a^2 + 2a + 3
= a - 1 remainder 6 or you can write it as a - 1 + 6 / (a + 3)
8 over 10 times by 100, and 11 over 15 times by 100 to find in percentage. Whichever number is bigger is your answer.