Find the difference. (9a^4+2a^2+-7a^2+1)
a. 25a^4-5a^2-4
b. -7a-5a^2+6
c. 25a^8+9a^4+6
d. -7a^4+9a^2+4

Aplane is taking off from bangladesh headed to new york city. at the same time, a plane from new york city is headed to bangladesh is also taking off. the plane bound to new york city is traveling at 600 mph, while the plane traveling to bangladesh is traveling at 400 mph. how far from new york city will the two planes meet if the distance between new york city and bangladesh is 8,000 miles?

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

If value of cos330° is √3/2 then find tan165°.