I need help with this test I’m online school and my teacher sucks at teaching plz help!!

38°

Step-by-step explanation:

The figure given is a triangle.

Sum of angles in triangle  = 180°

 So;

      ∠D + ∠E + ∠F  = 180°

       ( 5x - 2)  + (9x + 3) + (11x - 21)  = 180

         5x -2 + 9x + 3 + 11x -21 = 180

          25x -20  = 180

          25x  = 200

               x  = 8

Now since ∠D = 5x -2;

                 ∠D = 5(8) - 2 = 38°

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: