What is the value of this expression when f = 4?
1 answer:
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Answer:
B
Step-by-step explanation:
Since the triangle is right use Pythagoras' identity to solve for x
The square on the hypotenuse is equal to the sum of the squares on the other two sides, that is
x² + 7² = 12², that is
x² + 49 = 144 ( subtract 49 from both sides )
x² = 95 ( take the square root of both sides )
x = ≈ 9.7 ( to the nearest tenth )