A quadrilateral is drawn on a coordinate grid. The vertices of the quadrilateral are located at the ordered pairs listed below. (2,3) (8,3) (7,6) (5,6)
Which statement about the quadrilateral is true?

The quadrilateral is a trapezoid with an area of 12 square units.
The quadrilateral is a trapezoid with an area of 18 square units.
The quadrilateral is a parallelogram with an area of 12 square units.
The quadrilateral is a parallelogram with an area of 18 square units.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables

What makes a trapezoid an isosceles trapezoid?