Law of cosines plz help me

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.

It says factor each expression completely 8y+48

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?