Can someone please help my out with the question.

I'l mark you brainliest, give you 5 stars and say thanks.

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.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

How do i simply this radical expression?