Answer: The nineteen centres are not based at low income schools throughout the country
Explanation:
Negative form: The negative form of a sentence is used to convey the opposite meaning by including a negation word, such as "not."
In the original sentence, "The nineteen centres are based at low income schools throughout the country," the positive statement asserts the presence of the centres at these schools.
How to change it: By adding "not," the rewritten sentence, "The nineteen centres are not based at low income schools throughout the country," directly contradicts the original assertion, indicating that the centres are not located at low income schools.