Part A While hiking, David climbed up 200 meters. If David started at 700 meters above sea level, which integer represents his elevation?

Part B
What would have been the elevation if he had descended 300 meters from his starting point instead?

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

i think the length is 12 and the width is 17