I earn £30 000 in 12 months. 20% of this is deducted for tax.
x% is deducted for National Insurance.
At the end of each month I have £1800 left.
Work out the value of x.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.

For the sequence [tex]a_{n} = 2n/(n+1)[/tex], what is the value of [tex]a_{10}[/tex]