The definition of compel is "to force or oblige someone to do something". The speaker says she was "compelled" to help Heathcliff; he hasn't the wit, or is not smart enough to think she was helping him because she wanted too, but in reality, she didn't have a choice, she was forced to.
1/2 of the flowers in Yoshi's Gardens are yellow tulips. To find the answer you can multiply the two fractions together. When you cross multiply you get 2/4 which can be reduced to 1/2.
