Question 832169
The distributive property is exactly (C)
.
15x(3+5)
you could solve this by adding the 3 and 5 together to get 8.  But you don't always have like terms.  What if it was 15x(3y+5)?  Then the distributive property would help a lot. 
First, you would have 15x * 3 and then 15x * 5.  You'll get the same answer.