If he takes a train there it will take him 5 and 1/8 hours to get there if he takes a plane it will take him 2 and 2/3 to get there. how many hours does the plane save

they are simplified

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!

it would open into a square depending on the type of envelope i’m not sure about the second part

113.1

step-by-step explanation:

v=4

3πr3=4

3·π·33≈113.09734