Answer:
20 units
Step-by-step explanation:
The Pythagorean Theorem states that:
[tex]a^{2} + b^{2} = c^{2} \\[/tex]
Now we can insert values into the equation.
[tex]a = 15\\b = b\\c = 25\\[/tex]
Now we can plug these ☝ values into the Pythagorean Theorem:
[tex]15^{2} + b^{2} = 25^{2}\\[/tex]
After we solve for [tex]b[/tex] we get:
[tex]b^{2} = 400\\b = 20[/tex]
