Atriangular pyramid is cut by a plane. in which case is the cross section a quadrilateral?
a) when the plane is perpendicular to the base and passes through the apex
b) when the plane is parallel to the base of the pyramid
c) when the plane intersects the base and two lateral faces of the pyramid
d) when the plane intersects the base and all three lateral faces of the pyramid

The mean temperature for the first 4 days in january was 7°c. the mean temperature for the first 5 days in january was 5°c. what was the temperature on the 5th day?

The accompanying table shows the numbers of male and female students in a particular country who received bachelor's degrees in business in a recent year. complete parts (a) and (b) below. business degrees nonbusiness degrees total male 189131 634650 823781 female 169539 885329 1054868 total 358670 1519979 1878649 (a) find the probability that a randomly selected student is male, given that the student received a business degree. the probability that a randomly selected student is male, given that the student received a business degree, is nothing. (round to three decimal places as needed.) (b) find the probability that a randomly selected student received a business degree, given that the student is female. the probability that a randomly selected student received a business degree, given that the student is female, is nothing. (round to three decimal places as needed.)

Using elimination, what is -4x+2y=-12 4x+8y=-24