The basement of a building is 40 feet below ground level. The building’s elevator rises at a rate of 5 feet per second. You enter the elevator in the basement. Let t represent the number of seconds you are in the elevator and h t( ) represent how high the elevator has risen (in feet) in t seconds.

18a

step-by-step explanation:

simply because it is. it's the highest common factor

.mp4 files, because, video

step-by-step explanation:

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!