Answer:

Step-by-step explanation:
<u>Density</u>
The density of an object of mass m and volume V is given by

It can be expressed in common units like
or any other combination of proper mass [M] by volume [V] units.
The data provided in the question is


Thus, the measured density is


We have expressed the result with 1 decimal place because the mass was measured to the nearest hundred milligrams (or one-tenth grams). Any further decimal is senseless because that precision comes from calculations, not from measurements.
Answer: 540
Step-by-step explanation:
A pentagon has a 3 diagonals so you multiply 180 by 3 which equals 540
4(2m-n)-3(2m-n)
4(2(-15)- -18)-3(2(-15)- -18)
4(-30- -18)-3(-30- -18)
4(-12) -3(-12)
-48- -36
-12
The answer is C