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

An electronics manufacturer wants to know if customers would be interested in a detachable keyboard for their tables and if so, what the most important features would be. the manufacturer partners with an electronics store to include copies of the survey with every purchase at that store for one week. which of the following best explains why this random sample is unlikely to be a good representative sample of tablet owners' preferences for a detachable keyboard? a) one week is likely not enough time to get a large enough sample. b) most people won't bother to send in the survey, which is likely to skew the results c) there is no way to verify whether the responders to the survey actually own a tablet d) the survey is biased because it was conducted through an electronics store, not the general population

John bought 2 horses at rs 20000 each

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}