Who wants to be friends 1*1

Can someone me with the property questions for 12 13 and 14 plz

What is the value of x enter your answer in the box (3x+50

Fred and gene are hang gliding. fred is 700 feet above the ground and descending at 15 ft/s. gene is decending as shown in the table. interpret the rates of change and initial values of the linear functions in terms of the situations they model. show all work. freds equation is f(x)=-15x+700. ( genes is the table attached)