If you multiply the slopes of two perpendicular lines, what is the result?

2) if line a contains the points (3, -4) and (6, -2), and line b contains the points (-1, 5) and (1, 2), prove that the lines are perpendicular by multiplying their slopes.

3) line a and line b are perpendicular. line a contains the points (4,2) and (-1, 3). if one of the points on line b is (3, 7), find another point on line b.
(i got number 2 however dont know how to do 3) !

Josephine has a great garden with and area of 2x2 + x - 6 square feet

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

On saturday a souvenir shop had 125 customers.sixty four percent of the costumers paid with a credit card. how many costumers paid with cash?