22. In a survey of 26 instructors, it was found that 11 liked whiteboards, 18 like blackboards, and 8 liked both. How many instructors like whiteboards only? How many instructors liked blackboards only? How many instructors liked neither?

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.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)