Simplify (a + b - c)(a + b + c)

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.

I’m really confused and need to learn this

Jane has 5 nickels.john has 3 dimes.jane says she has a greater amount of money.with the information given,is she correct?