It could be (4*7) minus (1*1) = 27
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7/4 Not 7/4 it is 1and 3/4 (one and three quarters)
This is not possible, 27 is an odd number, 4 odd numbers will always equal an even number.
0.25
The slope is (9 - -1)/(2 - 4) = 10/-2 = -5
3 x 9 =27 , assuming you don't need to use all the numbers given.