What is 6.38 × 10 exponent 3

In two or more complete sentences, formulate how to use technology to calculate the appropriate regression model for the given data. you are not required to find the model, just choose the appropriate regression and explain how to use the technology. (-5,,2.,0.8), (0,-0.5), (2,-1.3), (3,-0.8), (5,2)

Is this a polynomial function? i need to know asap

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?