You descend 170 feet before ascending 72 feet. there is another 88 foot drop followed by a 40 foot climb. then you ascend another 50 feet. what is your elevation after the last change in elevation.

Ok so descend means to go down and ascend means going up. With that in mind, you know what operations to use. You start at -170 and then climb up 72 feet. 170-72= 98. Now you drop -88. 98-88=10 go up 40 next 10+40= 50. Lastly, you go up by 50 feet. 50+50=100 which means your current elevation is 100 feet. I hope this helps you :)

No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer