\
The expression is 3(a + 5).
= 3(a) + 3(5) (Distributive property: a(b + c) = ab + ac)
= 3a + 15 (Multiply: )
3(a + 5) = 3a + 15.
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)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")