Scientists want to estimate the mean weight of mice after they have been fed a special diet. from previous studies, it is known that the weight is normally distributed with standard deviation 5 grams. how many mice must be weighed so that a 95% confidence interval will have margin of error of 0.4 grams?

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.

What am i doing here. add?

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2