An oak tree that is 220 years old produced acorns at two different rates. until it reached maturity, it produced an average of 900 acorns a year. however, once the tree reached maturity, it produced an average of 2200 acorns a year. one particular tree, angel oak, has produced about 289,000 acorns in its lifetime. at what age did it reach maturity?
a) 188
b) 150
c) 138
d) 148

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?