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  a) is a function

  b) is not a function

Step-by-step explanation:

a) No vertical line intersects the curve more than once. It passes the vertical line test, so IS A FUNCTION.

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b) There are vertical lines that intersect the curve more than once: x=3, for example. The graph does not pass the vertical line test, so DOES NOT REPRESENT A FUNCTION.

the correct answer is semicircle

step-by-step explanation:

the answer is semicircle because the shorter arc joining two points on the circumference of a circle is known as the minor arc, the larger arc is called the major arc, and a semicircle is a half circle, formed by cutting a whole circle along a diameter line.

hope i .

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step-by-step explanation: