Which of the following expressions are equivalent to 2/x^8-y^8? choose all that applya.2/(x^4-y^4)*1/(x^4+y^4)b.2/( x^4)^2-(y^4)^2c.2/(x4-y^4)*1/(x^4-y ^4)d.1/(x^4-y^4)*1/(x^4+y^4)

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

With alll of except for the 2 that i did already

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?