7. You have only nickels and dimes in your piggy bank. When you ran the coins through a change counter, it indicated you have 590 cents. Write an equation that represents this situation. What are
three combinations of nickels and dimes you could 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.