Question 17
VariationIf y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64.
- A.5
- B.12
- C.6
- D.3
Show the answer and explanation
Answer: C (6)
Explanation
y = k√x: 3 = 4k, so k = ¾. When x = 64, y = ¾ × 8 = 6.
If y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64.
Answer: C (6)
y = k√x: 3 = 4k, so k = ¾. When x = 64, y = ¾ × 8 = 6.