Find the value of f(3) for the function.
f(x) = - 7(x + 2)

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Determine domain and range, largest open interval, and intervals which function is continuous.