Assume that x and y are both differentiable functions of t and are related by the equation y=cos(4x). Find dydt when x=π8, given dxdt=−3 when x=π8. Enter the exact answer. dydt= Number

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Which of the following are accepted without proof in a logical system? check all that apply.

Find the area of the regular hexagon if a side is 20 cm.