donna purchased a prepaid phone card for 20$, long distance calls cost 17 cents a minute using this card. Donna used her card only once to make a long distance call. if the remaining credit on her card is 15.07, how many minutes did her call last?

Math it's appreciated. (picture provided)

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.