Every 3rd number is even with 2 odd numbers in between successive even numbers.
999/3 = 333 x 2 = 666.
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Thank you,
Darian
<span>3x^2+5x-17+6x+20
3x^2 </span>+6x+5x-17+20
3x^2 +11x-17+20
3x^2 +11x+3
Area=basexheight
Area=9x4
Area=36
You add 1.7 and 3.1 and that will be the answer to r which is 2.6
