Simply the following:6s^5t x S^4t2

6 * s^ (5t + 4t^2)

Step-by-step explanation:

There are two expressions here that contain the base s: s^5t and s^4t^2. As part of the simplification process, we multiply these together (which involves adding the exponents):

s^5t * s^4t^2 = s^ (5t + 4t^2)

Then 6s^5t x S^4t2 becomes 6 * s^ (5t + 4t^2)