Difficulty: Easy
Correct Answer: 1.45
Explanation:
Introduction / Context:
This expression combines multiplication, subtraction, addition, and an implied square. Correct evaluation depends on strict application of precedence: powers, then multiplication/division, then addition/subtraction, all left to right.
Given Data / Assumptions:
Concept / Approach:
Compute products and powers first, then combine with additions/subtractions. After reducing numerator and denominator, perform the final division, simplifying to decimal if appropriate.
Step-by-Step Solution:
Numerator: 14 × 3 = 42; then 69 − 42 + 2 = 27 + 2 = 29.Denominator: 9 × 5 = 45; (5)^2 = 25; then 45 − 25 = 20.Value = 29 / 20 = 1.45.
Verification / Alternative check:
Convert to fraction and mixed number: 29/20 = 1 and 9/20 = 1.45; arithmetic is consistent.
Why Other Options Are Wrong:
2.75, 26.5, and 265 are orders of magnitude off; 1.2 reflects miscomputing the numerator or denominator.
Common Pitfalls:
Treating (5)^2 as 10; adding before doing the product 14 × 3; forgetting the final +2 in the numerator.
Final Answer:
1.45
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