Both B and D are 3rd degree, but only D is a 3rd degree binomial because it has only 2 terms. The answer is D.
6/10
300/500
30/50
60/100
12/20
Answer:
5.66 inches
Step-by-step explanation:

a² + 7² = 9²
a² + 49 = 81
a² + 49 - 49 = 81 - 49
a² = 32
a = square root of 32
a = 5.6568 or 5.66 inches
I used the Pythagorean Theorem to solve this.