Find the total surface area of this object

Describe all the numbers that when rounded to the nearest thousand are 645,000

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

Will give brainliest what is the value of x? enter your answer in the box.