A bracelet contains gold and copper in the ratio 15 : 7. Find the amount of gold in a bracelet weighing a total of 176 g.

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?