Сумма квадратов от 50 до 100

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?