<p>Do you have to know Matrices for the ACT? How often do they come up?</p>
<p>Sort of; not very often at all. Just plug them into your calculator if youre having trouble.</p>
<p>yea put em in ur calc if ur lazy, there is a formula think its # of table x # of row</p>
<p>I did get a question about a determinant once. Again, your calculator is your best friend.</p>