Find the value of z: 1/2 Z=8

This is 6th grade math

State whether weight is a function of height for the six students and explain. a. yes, height is a function of weight because two students weigh 165 pounds but have different heights. b. no, height is not a function of weight because two students weigh 165 pounds but have different heights. c. yes, weight is a function of height because for each value of height there is one corresponding value of weight. d. no, weight is not a function of height because there is not enough data to determine a function.

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Solve for n? [tex]z = \frac{3}{4} mn[/tex]