Which steps when multiplying decimals do we not care about the decimal point? PLEASE HELP THIS IS 6th grade work

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

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.

The graph represents f(x)=[x]+3. what is f(-2.2)?