Final answer:
X increased by 30% can be represented as X + 0.3X.
Step-by-step explanation:
To translate English to algebra, we need to convert the given sentence into an algebraic expression.
The sentence "X increased by 30%" can be represented as X + 0.3X.
This is because when you increase a value by a certain percentage, you add that percentage of the original value to the original value.