mass is the answer
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Algebra can be used to determine what dimensions to use to make a box with a given volume and use the least material possible. A carpenter uses algebra in order to calculate the area of a space in order to buy supplies, calculate estimates for jobs, measure and cut supplies need to correctly to a job. A carpenter will also use algebra to build and estimate space needed for installation of appliances and objects. Also He uses it to find the angle at which two walls are put together, how long he must cut how many pieces of wood. How much cement he needs to go with the 30 yards of sand and gravel that was just delivered for a slab of a given size.
you multiply when you are finding the volume of something is because that is how you find how much space something takes
You should use a special device for measuring angles - a protractor. With a ruler, it is much more complicated, but still possible: you can mark two points on the angle, one on each side; measure the distance from the vertext of the angle to those points; measure the distance between the points; then use the Law of Cosines to calculate the angle.
The median.
There are no 20cent coins. And you can't solve that question with the information given. You need the dimensions of the coins