Answer:
Step-by-step explanation:
[tex](1)\ x^2=10^2+7^2\\ \\ x^2=149\\ x=\sqrt{149}\\ \\ x\approx 12.2\\ \\ (2)\ x^2=21^2-19^2\\ \\ x^2=80\\ \\ x=\sqrt{80}\\ \\ x\approx 8.9\\ \\ (3)\ obtuse\\ \\ (4)\ sin24=\frac{x}{9}\\ \\ x=9sin24\\ \\ x\approx 3.7[/tex]
