A conductor is mapping a trip and records the distance the train travels over certain time intervals. time (hours) distance (miles)
0.5 22.5
1 45
1.5 67.5
The train travels at a constant speed. What is its speed?
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Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

How does a low unemployment rate affect a nation's economy? a. the nation has a higher number of productive resources. b. the nation can spend more money on for unemployed people. c. the nation can save money by paying lower salaries to a large workforce. reset

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