Answer: 285.2 kg
Step-by-step explanation:
Given
The volume of helium in the balloon is 
The density of the helium is 
Mass of the helium gas is given by the product of density and volume

Thus, the mass of gas is 285.2 kg
Answer:
A) −20
Step-by-step explanation:
−5/3 (−2/3 )(−18)
Multiply the first and second terms. A negative times a negative is a positive
-5/3 * -2/3 = 10/9
10/9 * -18
Rewriting for easier math
-18/9 * 10
-2 * 10
-20
For convenience sake, I will let 
First, we evaluate the function at the endpoints of the interval.

Then, we need to find the critical points.
We can start by taking the derivative using the power rule.

Setting this equal to 0,

Since
, we can divide both sides by
.


So, the absolute minimum is
and the absolute minima are 