Write each of the following as a mathematical expression. state whether the expression is linear or nonlinear. if it is nonlinear, then explain why. 1. a number decreased by three squared 2. the quotient of two and a number, subtracted from seven 3. the sum that represents the number of tickets sold if 35 tickets were sold on monday, half of the remaining tickets were sold on tuesday, and 14 tickets were sold on wednesday 4. the product of 19 and a number, subtracted from the reciprocal of the number cubed