Question

Part A

Answer 1

Answer:

Part 1: D

Part 2:  23.2.

Step-by-step explanation:

$a^{2}$+$b^{2}$=$c^{2}$

$a^{2}$+(2$x^{2}$)=(8$x^{2}$)

$a^{2}$=64$x^{2}$-4$x^{2}$

$a^{2}$=60$x^{2}$

$a^{2}$=$\sqrt{60x^{2} }$

$\sqrt{4\\}$*$\sqrt{15}$*$\sqrt{x^{2} }$

2*$\sqrt{15}$*x

2x$\sqrt{15}$

2(3)$\sqrt{15}$

6$\sqrt{15}$ (Plug into a calculator.)

23.2