Why does an investigator change the value of a variable parameter during an investigation

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32

Solve for x. −3/4(x+2)=6 enter your answer in the box

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?