Calculate the determinant of a= 1 -1 a 1 1 . for which a is a invertible? 1-1 1 1 a

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

umumumumum

im not sure

answer: the answer is ann

step-by-step explanation:

one day the were 5 ducks, and their king told them to multiply their kingdom. so each went their own seperate way and met 4 other ducks on their journey.

when the ducks returned to their kingdom, it was discovered that there were 5 groups of 5 ducks. when the kind counted the number of ducks in total (including the ones he sent out earlier) he counted 25.

therefore 5 times 5 is 25.

the end. : )