Below is the speed vs. time graph of a cart. During which section or sections of time is the cart an energy source? Question 3 options:

a)D only

B)A & C only

c)C only

D)B & D only

E)A only

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 area of the trapezoid shown ?

Interpret the following expression (5y^2-7)^3/(2y)^2