Can someone help me here.

I cant find a good solution for my fist java script class. Can someone help me here. The result is not showing up here.

<script language = "JavaScript">
document.write('<center><h3>-- Myname 23 -- ')
myDate = new Date ();
document.write(myDate.toLocaleString());
document.write('</h3></center><hr>');

</script>

<script language = "JavaScript">

// Add, subtract, multiply, and divide
var firstvar;
var secondvar;
var resultvar;

// Add 23.5 and 15

document.write ('adding 23.5 and 15

');
firstvar=23.5;
secondvar=15;
resultvar

document.write(firstvar);
document.write('
');

document.write(secondvar);
document.write('
');

document write('---');
document.write('
');

resultvar = firstvar + secondvar;
document.write(resultvar);
document.write('

');

// Subtract 45 from 10

document.write ('subtracting 45 from 10

');
firstvar=10;
secondvar=45;

document.write(firstvar);
document.write('
');

document.write(secondvar);
document.write('
');

document.write('---');
document.write('
');

resultvar= firstvar - secondvar;
document.write(resultvar);
document.write('

')

// Multiply 2.5 by 15

document.write ('multiplying 2.5 by 15

')
firstvar=2.5
secondvar=15

document.write(firstvar);
document.write('
');

document.write(secondvar);
document.write('
');

document.write('---');
document.write('
');

resultvar= firstvar * secondvar;
document.write(resultvar);
document.write('

');

// Divide 144 by 12

document.write ('dividing 144 by 12

');
firstvar=144;
secondvar=12;

document.write(firstvar);
document.write('
');

document.write(secondvar);
document.write('
');

document.write('---');
document.write('
');

resultvar= firstvar / secondvar;
document.write(resultvar);
document.write('

');
</script>