Why is 2 times 3/4 less then 2

The function models the number of accidents per 50 million miles driven as a function

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

How many terms does the polynomial x^2 y^2 have