A cabin has room for 7

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Is this a polynomial function? i need to know asap