What is b if the expression is (4/5 divided by b)+b explain this = 27

Write each expression in exponential form and find its value.| ! 2 x 2 x 2 x 2

How do i do this? i don’t understand

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.