Question

Matrices Question Help.

Answer 1

I thought it would be just a simple multiplication of matrices but apparently its C.

Don't understand how though.

Answer 2

Yeah my first thought was to compute `T*U` but apparently it's `U*T` if C is the correct answer. Let me think some more.

Answer 3

Vince:
takes 12 min to fix one photocopier
takes 8 min to fix one fax machine
takes 20 min to fix one scanner
I'm reading the first column of matrix T

school A has 5 photocopiers, 3 fax machines, 2 scanners (reading row 1 of matrix U)

so if we take the dot product of row1 of matrix U with column1 of matrix T, then we get

12*5+8*3+20*2 = 124

which should be the value in row1,column1 of the answer. Which choice C does have

so `U*T` is starting to make a bit more sense now. Hopefully you agree? or no?

Answer 4

we want to take a pfs column vector, and multiply it by a pfs row vector.

Uv = Vances times
Un = Nevs times
Ur = Ranis times

U [v n r]= UT