Acompany designed and sells an ultrasonic receiver, which detects sounds unable to be heard by human ear. the receiver can detect mechanical and electrical sounds such as leaking gases, air, corona, and motor friction noises. it can also hear bats, insects, and even beading water. the receiver is 21 in deep. the focus is 7 in from the vertex. find the diameter of the outside edge of the receiver.

To find the extreme values of a function f(x. y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x, y)=xy

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8