Can someone please help me???
I need help with this

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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.