Let A = 1 2 1 −2 and b = 4 0 be a 2 × 2-matrix and a 2 × 1-column vector respectively. Write b as a linear combination of the column vectors of A, and hence conclude that the linear equation Ax = b is consistent.

i don't know, but that looks pretty bad. my school passed us unless we failed in all the subjects, but idk abt ur school's rules.

copyright potato 2019.

one fourth of 9% = 2.25%

gavin is correct in saying : the equivalent quarterly interest rate would be

2.25%.