Density is mass divided by volume. find the density of an aluminum block with a mass of 35 grams and a volume of 14 cm3? .

Density is mass divided by volume.                          

The mass is given as = 35 grams                    

Volume is given as = 14 cubic cm.                      

So, density is = gram per cubic cm.                

Hence, the density is 2.5 gram per cubic cm.

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)