Please help me!!! I don’t understand this Fully

What is the simplified form of square root of 400 to the 100th power ?

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price

You are living in aldine, tx and you are planning a trip to six flags in arlington, tx. you look on a map that has a scale of 0.5 inches to 30 miles. if the map shows the scale distance from aldine to arlington is 4 inches, how far is the actual distance?