3. Which of the following relations are
functions?
1. x² + y^2 =4
II. x - y = 2x
III. y=(square root 4-x)
IV. x= y^2-1
V. y=x²-1
VI. x^2 = y^2

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.