What is X and Y in this balanced reaction: MnO4–(aq) + 5Fe2+(aq) + X H+(aq) → 5Fe3+(aq) + Mn2+(aq) + Y H2O(l)a. X = 2 and Y = 4b. X = 4 and Y = 2c. X = 4 and Y = 8d. X = 8 and Y = 4

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 effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?