So we know that 3/4 is equivalent to 9/12, because 3Ã12=36 and 4Ã9=36. A simple way to look at how to check for equivalent fractions is to do what is called âcross-multiplyâ, which means multiple the numerator of one fraction by the denominator of the other fraction.nd yes grasshopper, 2/4 is an equivalent fraction for 4/8 too.As you already know, we are nuts about rules. So, letâs look at the Rule to check to see if two fractions are equivalent or equal. The rule for equivalent fractions can be a little tough to explain, but hang in there, we will clear things up in just a bit.
Common sizes used in the office and the home are A4 and A3 (A3 is the size of two A4 sheets). The density of paper ranges from 250 kg/m3 (16 lb/cu ft) for tissue paper to 1,500 kg/m3 (94 lb/cu ft) for some speciality paper. Printing paper is about 800 kg/m3 (50 lb/cu ft).
(b) To expand along the third column, I need to find the minors and then the cofactors of the third-column entries: a1,3, a2,3, a3,3, and a4,3. Wait a sec... The a2,3-entry of the original matrix is zero. This means that I'll be getting zero for that term when I expand down the column, no matter what the value of the minor M2,3 turns out to be. So I don't really care what the A2,3 cofactor is; I can just put 0 for this entry, because a2,3A2,3 = (0)(A2,3) = 0.