Washing his dad's car alone, Taylor takes 6.5 hours. If his dad helps him, then it takes 4 hours. How long does it take Taylor's dad to wash the car by himself?

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!