Find the value of n.
A. 9
B. 22.5−−−−√
C. 45−−√
D. 18

Answer:
A. 9
Step-by-step explanation:
[tex]{n}^{2} - 3 = 2 \times 39 \\ {n}^{2} - 3 = 78 \\n^{2} = 78 + 3 = 81 \\ n = \sqrt{81} = 9[/tex]