5(2x + 3)
Distribute the 5 to the number in the parentheses. In other words multiply 5 to every number inside the parentheses, these being 2x and 3. So...
(5)(2x) + (5)(3)
10x + 15
So one of the answers will be B.
10x can be split up. 8x plus 2x is equal to 10x therefor another of the answers is C. 8x + 2x + 15
Hope this helped!