Samantha was writing down the list of all equipments that she would require for recording her composition. At the top of the list she wrote, "microphone with a large diaphragm." Which type of microphone did Samantha refer to by specifying that the microphone should have a large
diaphragm?
Samantha referred to the
microphone, which has a larger diaphragm.
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the answer is b i think

if triangle abc is congruent to triangle def, their interior angles are congruent, because congruent parts of congruent triangles are congruent (cpctc).

that means ∠d is congruent to ∠a; ∠d is equal to 8x - 2.

interior angles of all triangles add to equal 180 degrees, so you can set the sum of these interior angle values equal to 180 and solve for x.

180 = (8x - 2) + 22 + 72

180 = 8x - 2 + 22 + 72

180 = 8x + 92

88 = 8x

11 = x

x = 11