<span>To get the Greatest Common Factor (GCF) of 36 and 42 we need to factor each value first and then we choose all the copies of factors and multiplythem: </span> <span> 36: 223<span>3 </span></span><span> 42: 2 3 <span>7 -------------- </span></span><span>GCF: 2 3 </span>
Therefore, The Greatest Common Factor (GCF) is: 2 x 3 = 6
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If each ticket is $9.75, then you multiply $9.75 by how many tickets he's buying. In this case he's buying 3, so it's 9.75x3. The total for that is $29.25. You subtract $28.25 from $43 and that leaves him with $13.75