Which of the following represents a function? A.(2, 3), (4, 3), (-2, -3), (-4, -3)
B.(3, 4), (-3, 2), (3, 8), (5, 5)
C.(-1, 2), (-2, 1), (-1, -2), (-2, -1)
D.(5, 1), (5, 2), (5, 3), (5, 4)

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?