Which set of points represents a function?

a. (1, 4), (–1, 4), (4, 7), (–4, 2), (3, 6)

b. (–1, 4), (–1, 2), (4, 7), (–1, 2), (3, 6)

c. (1, –4), (–1, 2), (4, –7), (3, 2), (3, –4)

d. (1, 4), (–1, 2), (4, 7), (–1, 3), (3, 4)

When turned about its axis of rotation, which shape could have created this three-dimensional object?

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm