Beth has only 20p and 10p coins in her purse. She has three times as many 20p coins as 10p coins.
If Beth has £2.80 altogether, how many 20p coins does she have?

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