Is first differences the same as slope

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Twelve less than a number is at most 20

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample