Which of the following is equivalent to

Answer:
[tex]=4\sqrt{10}[/tex]
Step-by-step explanation:
[tex]3\sqrt{40}-2\sqrt{10}\\3\sqrt{40}=6\sqrt{10}\\=6\sqrt{10}-2\sqrt{10}\\\mathrm{Add\:similar\:elements:}\:6\sqrt{10}-2\sqrt{10}=4\sqrt{10}\\=4\sqrt{10}[/tex]