What is the inverse of \left [ \begin{matrix} 5 & 3\\ 2 & 1 \end{matrix} \right ]? Match the number to the appropriate letter in \left [ \begin{matrix} A & B\\ C & D \end{matrix} \right ].

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

How can you construct perpendicular lines and prove theorems about perpendicular lines