PLEASE HELP ON 13 TO BE MARKED THE BRAINLIEST

  D) 10000 feet

Step-by-step explanation:

We are told that for some actual altitude, the reading is ...

  30,000 ft = (1 -25%)altitude = 0.75×altitude

Multiplying by 4/3, we have ...

  (4/3)(30,000 ft) = altitude = 40,000 ft

To get to 30,000 ft, the plane must descend ...

  40,000 ft -30,000 ft = 10,000 ft

47 - 90 = 43

43 - 180 = x

x = 137

but which class are u may know that first