12 x 8 is 96 since 11x 8 is 88 add 8 more and you get 96
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8 x 12 = (8 x 10) + (8 x 2) = 80 + 16 = 96
x+y=12 x-y =4 x=12-4 =8 8+y=12 y=12-8 =4 so x=8 y=4 8+4=12 8-4=4
12 x 8 x 5 = 480 cubic inches
If the equation is structured like this: (8/x)=(12/(x+2)) then x=4. If the equation is structured like this: (8/x)=(12/x)+2 then x=-2.
12C4 = (12!)/[(12 - 4)!4!] = (12!)/(8!4!) = (12 x 11 x 10 x 9 x 8!)/(8! x 4 x 3 x 2 x 1) Simplify 8! with 8!, 12 with 4 x 3, 10 with 2 = 11 x 5 x 9 = 495 Or you can use the graphing calculator: press 12, MATH, go with the right arrow to PRB, press 3 for nCr, ENTER