1 answer:
            
              
              
                
                
Answer:
x = 4√5
General Formulas and Concepts:
<u>Pre-Algebra</u>
- Order of Operations: BPEMDAS
<u>Trigonometry</u>
- Pythagorean Theorem: a² + b² = c²
Step-by-step explanation:
<u>Step 1: Define</u>
We are given a right triangle. We can use Pythagorean Theorem.
a = 19
b = x
c = 21
<u>Step 2: Find </u><em><u>x</u></em>
- Substitute:                    19² + x² = 21²
- Isolate <em>x</em> term:               x² = 21² - 19²
- Evaluate:                       x² = 441 - 361
- Subtract:                       x² = 80
- Isolate <em>x</em>:                       x = √80
- Simplify:                        x = 4√5
And we have our final answer!
 
                                
             
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