Will give brainliest to right answer
consider u = {x|x is a positive integer greater than 1}.

which is an empty set?

{x|x ∈ u and is prime}
{x|x ∈ u and 2x is prime}
{x|x ∈ u and can be written as a fraction}
{x|x ∈ u and 2x can be written as a fraction}

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 πr2h.)

27 is what percent of 108? 27 is % of 108

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3