Does the unit normal vector with its tail at{x[t],y[t]} pointout away from the curve toward your right foot, or does it point inside the curvetoward your left foot?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

When you answer this can you explain

Prove that 16^4-2^13-4^5 is divisible by 11.