Does each situation describe a survey, an experiment, or an observational study?

select survey, experiment, or observational study for each situation.

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.

Use the distributive law to multiply. 3(4x + 5y + 6)

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?