You are standing above the point (4,3) on the surface z=15−(2x2+y2). (a) In which direction should you walk to descend fastest? (Give your answer as a unit 2-vector.)

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

Which planet do you think would be easiest for humans to colonize some day?