Final answer:
No, 7.2 x 4¹⁰ is not written in scientific notation because it does not follow the format a x 10⁻¹¹ where 1 ≤ a < 10.
Step-by-step explanation:
The expression 7.2 x 4¹⁰ is not written in scientific notation.
Scientific notation requires a format of the form a x 10⁻¹¹, where 1 ≤ a < 10 and b is an integer.
To convert 7.2 x 4¹⁰ into scientific notation, you would need to express the 4¹⁰ as a power of 10 and adjust the coefficient (7.2) to meet the requirement that it is a number between 1 and 10.