Suppose we want to choose 3 letters without replacement from the 4 letters a, b,c and d, how many ways can this be done if the choice matters or does not matter

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities