In a chemical compound there are 3 parts zinc for every 16 parts copper, by mass a piece of the compound contains 320 grams of copper. Determine the amount zinc in the chemical compound

How many $20 bills do you need to have to make $280

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

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²