A passenger train left the station going 36 mph. An hour earlier a freight train left the station going 24 mph in the same direction. How many hours did it take for the passenger train to catch the freight train? Round to the nearest hour

The answer is $9.90 with rounding to the nearest tenth

2.4+3.2t. you get the answer by adding the ones with variables and ones without

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.