It is 16.
4 x 4(4-4) = 4 x 40 = 4 x 1 = 4 or 4 + 4(4-4) = 4 + 4(0) = 4 + 0 = 4
Negative Minus Negative = Positive so -4-4= 4 ericrain- No... We have to use 4 fours not 2 fours, so 4+4(4-4)
The answer is 84 years. A score is a group of 20 items/people/years, etc.
Four by four or basically 4 x 4, is 16