An oil drilling company is drilling a hole. The elevation of the bottom of the hole changes by feet each day. After a certain number of days, the bottom of the hole is at an elevation of feet. Which equation can be used to find x, the number of days they drilled?

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

Which expression is equivalent to the expression shown?

What is the value of x when x + 7 = 21?