Evaluate the expression 3.14(a2 + ab) when a = 4 and b = 2. (Input decimals only, such as 12.71, as the answer.)
IT IS A WRITTEN RESPONSE HELP

  best answer for the question.1.     divide  7/24  by  35/48  and reduce the quotient to the lowest fraction. 

On a piece of paper graph f(x)=5•(0.4)^x

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.