Cupcakes Baked by Maria

Maria runs a small bakery. The number of cupcakes she bakes each day can be modeled by the linear function:

$$ C(x) = 10 + 5x $$

where $$ C(x) $$ is the number of cupcakes, and $$ x $$ is the number of hours she spends baking cupcakes. If she spends 3 hours baking, how many cupcakes does she bake? Please provide your answer as a whole number.