Distinguish between formal and informal methods of researching data for a business message.

Can someone me ? i’ll mark the best answer brainliest : )

Amanager of a store that sells and installs spas wants to prepare a forecast for january and june of next year. her forecasts are a combination of trend and seasonality. she uses the following equation to estimate the trend component of monthly demand: ft = 30+5t, where t = 1 in january of this year. seasonal relatives are 0.60 for january and 1.50 for june. what demands should she predict for january and june of next year

Which activity is not allowed in a 3 compartment sink