Which relation is a function? a. {(5, 3), (2, 8), (–5, –1), (4, 7), (2, 1)}
b. {(5, 3), (2, 8), (–5, –1), (4, 7), (5, 7)}
c. {(–5, 3), (2, 8), (–5, –1), (4, 7), (2, 2)}
d. {(5, 3), (2, 8), (–5, –1), (4, 7), (–2, 1)}

step-by-step explanation:

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

a is the correct

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it