There were 21 students in travis's fourth-grade class at the end of the year. during the year four new students joined his class, and two moved away. one student was transferred to another fourth-grade teacher. how many students were there in the beginning of the year?

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

Each equation given below describes a parabola. which statement best compares their graphs? x = 2y^2 x = 8y^2

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much