Find the area of the parallelogram with vertices: p(0,0,0), q(-4,3,-1), r(-4,2,-2), s(-8,5,-3).

Find the value of x for which the lines are parallel.

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.