#introt1{margin:0 auto; border:1px solid; padding:10px 20px; width:70%;}
#introt1 .top{vertical-align:top;}
#introt1 td{padding:5px}


/* ------------------------ */

.center{margin:0 auto;}

.numbers{margin-bottom:10px;}
.numbers td{width:35px; text-align:center;}
.numbers .bordered{border:1px solid;}
.numbersw td{width:75px;}

.e3t{margin:10px auto; border:1px solid; border-collapse:collapse;}
.e3t td, .e3t th{text-align:center; vertical-align:top; padding:4px 15px; border-right:1px solid;}
#examples .e3t th, #exercises .e3t th{width:auto; border-bottom:1px solid; border-top:1px solid;}


#example3 .ex{width:550px;}

/* --------------------------- */

.question input{width:3em;}
.question .fraction input{width:1.5em;}
.question .fractioni input{width:1.5em;}
.question .vector input{width:1.3em;}

.qpic{vertical-align:middle;}

.question .numbers td{text-align:left;}




#q4form select{margin-left:30px;}

#q7form .rightimage{margin-left:20px;}
#q7form input{width:4em;}

#s13a{width:75%; margin:10px 0px;}