Answer:
6.1 inches
Step-by-step explanation:
you are using the pythagorean theorem.
[tex]6.2^{2} + b^{2} = 8.7^{2}[/tex] so 6.2 and 8.7
[tex]38.44 + b^{2} = 75.69[/tex] so 38.44 and 75.69
[tex]b^{2} = 37.25[/tex] you subtract 38.44 from both sides
[tex]\sqrt{b^{2} } = \sqrt{37.25}[/tex] so [tex]b^{2}[/tex] and 37.25
b = 6.103277808
so the length b is about 6.1 inches
