Answer to question one-
The equation for density is mass/volume. Therefore, if we follow these steps, we can easily figure out which has the lowest density. The following is the math and densities for each sample
Sample 1- Volume 13 Mass 30
Equation is 30/13
Our density is about 2.3
Sample 2- Volume 20 Mass 72
Equation is 72/30
Our density is 2.4
Sample 3- Volume 2 Mass 22
Equation is 22/2
Our density is 11
Sample 4- Volume 41 Mass 103
Equation is 103/42
Our density is about 2.5
With our equation, we are able to find all of our densities. These are 2.3,2.4,11, and 2.5. The lowest or smallest number is 2.3.
Therefore the sample with the lowest density is sample A.
Question 5-
The answer is 14.
This is because the rock raises the water by 5. Using our equation from the last problem (Density=Mass/Volume). We can again find the answer.
The problem states that then mass is 70. We found out the volume is 5.
Our equation: 70/5
Our density: 14
The answer is C,14
