The weights of thoroughbred racehorses are normally distributed with a mean of 1140 pounds and a standard deviation of 100 pounds find the probability that a thoroughbred racehorse race weighs between 1000 and 1250.

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!