Answer:
y = 12.3 cm
Explanation:
Since the triangle is right with hypotenuse 15, use the cosine ratio to solve for y, that is
cos35° = =
Multiply both sides by 15
15 × cos35° = y, hence
y ≈ 12.3
12.3
cos(35) = y/15
y = 15 * cos(35) = 12.3
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