Answer:
b=21
Step-by-step explanation:
The Pythagorean theorem is: [tex]a^2 +b^2 =c^2[/tex]
We already have a and c so we have to rearrange for b.
[tex]b^2 = c^2-a^2[/tex]
We can put in the numbers we already have in a calculator to get:
[tex]b^2=(75)^2-(72)^2=441[/tex]
Then to get b we square root [tex]b^2[/tex]
[tex]\sqrt{b^2} = \sqrt{441} =21[/tex]
