Yvaries jointly as x and z. y equals 80y=80 when x equals 5x=5 and z equals 4z=4. find y when x equals 4x=4 and z equals 6z=6.

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?

Asap! i'm not good math and i'm lost.

Consider the following function. which of the following graphs corresponds to the given function? w. x. y. z. a. z b. y c. x d.