The toll T, in dollars, for a truck using a certain bridge is given by the formula ~$T =1.50 + 0.50(x - 2),$~ where x is the number of axles on the truck. What is the toll for an 18-wheel truck that has 2 wheels on its front axle and 4 wheels on each of its other axles?

$2.50$3.00

$3.50$4.00

\$5.00