A total of 639 tickets were sold for the school play. They were either adult tickets or student tickets. There were 61 fewer student tickets sold than adult tickets. How many adult tickets were sold?

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

Find the difference (8ab+a+2) - (3ab+6)

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.