Which property was used to simplify the expression? 3c+ 9 + 4c = 3c + 4c + 9

a: distributive property
b: commutative property
c: associative property
d: inverse property

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

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Graph y = -|x| + 2. click on the graph until the correct one appears.