Answer:
[tex]\displaystyle PQ \approx 5.2[/tex]
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Equality Properties
- Multiplication Property of Equality
- Division Property of Equality
- Addition Property of Equality
- Subtraction Property of Equality
Trigonometry
- [Right Triangles Only] SOHCAHTOA
- [Right Triangles Only] cosθ = adjacent over hypotenuse
Step-by-step explanation:
Step 1: Identify
Angle θ = 55°
Adjacent Leg = PQ
Hypotenuse = 9
Step 2: Solve
- Substitute in variables [cosine]: [tex]\displaystyle cos55^\circ = \frac{PQ}{9}[/tex]
- [Multiplication Property of Equality] Isolate PQ: [tex]\displaystyle 9cos55^\circ = PQ[/tex]
- Evaluate: [tex]\displaystyle 5.16219 = PQ[/tex]
- Rewrite: [tex]\displaystyle PQ = 5.16219[/tex]
- Round: [tex]\displaystyle PQ \approx 5.2[/tex]