Answer:
5: 740
6: x
7: (12x4) -8
8: $60
Step-by-step explanation:
18 boxes = 72% of the total number.
let the total number be x.
72% of the total number = 18
(72/100)*x = 18
0.72x = 18
x = 18/0.72
x = 25
So she had to pack 25 boxes. Option A.
Hope this explains it.
Im not sure but if I did this right you should get 89.1 but then yet again I am NOT sure so try to work it out
where det(<em>A</em>) = 1×1 - 2×1 = -1.
where det(<em>B</em>) = 0×2 - (-1)×1 = 1. Then
On the other side, we have
and det(<em>AB</em>) = det(<em>A</em>) det(<em>B</em>) = (-1)×1 = -1. So
and both matrices are clearly the same.
More generally, we have by definition of inverse,
where is the identity matrix. Multiply on the left by <em>A </em>⁻¹ to get
Multiplication of matrices is associative, so we can regroup terms as
Now multiply again on the left by <em>B</em> ⁻¹ and do the same thing: