Tia cuts a 4-meter 8-centimeter wire into 10 equal pieces. marta cut a 540-centimeter wire into 9equal pieces. how much longer is one of marta's wires than one of tia's

 Tia's wire is 4 meter and 8 centimeter long which is  that is  408 centimeter long and it is divided in 10 pieces.
tia = 408/10 = 40.8 cm
 Tia's wire pieces are 40.8 cm long

 Marta's wire, it is 540 centimeter long and is divided into 9 pieces
marta = 540/9 = 60 cm
 Marta's wires are longer than Tia's
Marta's wire is 19.2 cm longer than tias  

60cm - 40.8cm= 19.2 cm 

Do you need with the x value for the minimum? its always between the two intercepts for a parabola