Find the midpoint between the points (-1, 16) and (-9,-2)

X = -1 to -9 = -8 -> midpoint is -4
y = 16 to -2 = 18 -> midpoint is 9
(-4, 9)? 

Midpoint formula = (x^1 + x^2 / 2) , (y^1 + y^2 / 2)

-1 + -9/2 = -5.5                          16 + -2 / 2 = 7

Answer = (-5.5, 7)

The area of the room is given by:
 A = (6) * (12)
 A = 72 feet ^ 2
 For each 40 watt bulb we have:
 (515) / 72 = 7.152777778 footcandle
 The number of 40 watt bulbs is:
 N = (50) / (7.152777778)
 N = 7, 40 watt bulbs
 
 will be required about:
 N = 7, 40 watt bulbs