Compute the unit normal vector field that will give the surface parametrized by r(u, v) = eu cos(v), eu sin(v), uv , d = {(u, v) | 0 ≤ u ≤ 4, 0 ≤ v ≤ 2π} the downward orientation. (your instructors prefer angle bracket notation < > for vectors.)

Which of the following of the following sets of side lengths could not form a triangle?

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%

Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. what is the correct number? what might have been janice's error?