When they stretched the rope into the triangle shown below, they always got a right angle. This was useful
when planning the pyramids, for example.

i think it's b

step-by-step explanation:

because the graph is 2 above (0,0)

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50

5 pm

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!