Respuesta :

Answer:

2[tex]\sqrt{10}[/tex]

Step-by-step explanation:

You can get this by using the Pythagorean Theorem

a^2 + b^2 = c^2

where a and b are the legs and c is the hypotenuse

3^2 + b^2 = 7^2

9 + b^2 = 49

b^2 = 40

sqrt of both sides

b = [tex]\sqrt{40}[/tex]

b = 2[tex]\sqrt{10}[/tex]

if this helps please give me brainliest