You have one hour to complete 4 chores. If you give an equal amount of time to each chore, how many minutes do you have to complete each chore? PLEASE HELP ME :

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

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39