X varies inversely as y^2, and x = 4 when y = 10. Find x when y = 2.
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Answer:
x = 5
Step-by-step explanation:
using the sine or cosine ratio in the right triangle and the exact value
sin30° = , then
sin30° = =
=
( cross- multiply )
2x = 10 ( divide both sides by 2 )
x = 5