Discussion
Algebraic expression of sum of 10a and 15c can be written as
Answer: A
"Sum" means addition, and the two terms are unlike - one in \( a \), the other in \( c \) - so they cannot be combined.
\[ 10a + 15c \]
Only like terms may be added; \( 25ac \) would be the result of a quite different operation.
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