When erik went to bed one winter night in northern minnesota, the temperature was -2°f. by the time he got up the next morning, the temperature had dropped to -17°f. assuming the temperature dropped steadily through the night, what was the temperature in the middle of the night?
a) -19°f
b)-9.5°f
c) -15°f
d)-8.5°f

Equation for the calculation double 2 and then add 5

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.

Y+ 2/y is it a polynomial in one variable or not? and if so, why?