Calculate the residence time of sodium

Use T=(M)/(f)
Mass m (Tons) Sodium:2.8*10^(13)
Flow rate, F (Tons, Year) Sodium:3.5*10^(5)
Zach is investigating the residence time of sodium in sea water. According to Zach's data table, the residence time of sodium written in scientific notaton is?

Using the formula T = (M)/(F), where T is the residence time, M is the mass of sodium, and F is the flow rate of sodium.

Given:
Mass of Sodium, M = 2.8 * 10^13 tons
Flow rate of Sodium, F = 3.5 * 10^5 tons/year

Plugging the values into the formula:
T = (2.8 * 10^13) / (3.5 * 10^5)

Simplifying:
T = 8 * 10^7 / 10^5
T = 8 * 10^2

The residence time of sodium in sea water, written in scientific notation, is 8 * 10^2.