510 miles, 204/3 = 68
68x7.5= 520
5x-13=15+7x
-13=15+2x
-28=2x
-14=x
4 pizzas because, 12 slices /3 per person =4 and 16 people /4 = 4 pizzas
Area of the shaded region = Area <span>of a square - Area of a circle
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Side of a square = 2r
Area of a square = (2r)² = 4r²
Area of a circle = πr²
Area of the shaded region = 4r² - πr² = <span>r²(4-π)</span>
If the order matters it is a permutation. For example: if you are selecting 3 people to be on a committee it doesn't matter what order you select them, but if you're selecting three people to be president, vice president, and secretary the order in which you choose them matters the first person being president, the second person being vice president, and the third person be secretary