Fk(x)=5x-6, which expression is equivalent to (k+k)(4)?
a. 5(4+4)-6
b. 5(5(4)-6)
c. 54-6+54-6
d. 5(4)-6+5(4)-6

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.