Answer:
$23.80
Explanation:
To get how many gallons we need to fill the tank we need to subtract the actual gas from the 12-gallon tank.
12-5.2=6.8
So, Irene's car needs 6.8 more gallons to fill the tank.
To estimate the cost of the gas we need to multiply the price per gallon by the gallons the car needs to fill the tank.
3.50x6.8=23.8 or $23.80
Hence, Irene spent $23.80 to fill the gas tank.