Can someone me with this question ?

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.

Write a function rule for  “the output is  5 less than the input.” let  xx  be the input and let  yy  be the output.