40% of the marbles in a bag are red. The rest are orange and green. The ratio of the number of orange to the number of green is 4:5. If there are 30 green marbles, how many red marbles are there?

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.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

10% of 1,900,000. show me how you got the answer