question 12 (multiple choice worth 1 points) ...
question 12 (multiple choice worth 1 points) (06.03 mc) a hot air balloon holds 2,200 cubic meters of helium. the density of helium is 0.1785 kilograms per cubic meter. how many kilograms of helium does the balloon contain, rounded to the nearest tenth of a kilogram? 392.7 kg 2,199.8 kg 2,200.2 kg 11,195.9 kg question 13 (multiple choice worth 1 points) (06.04 lc) what is the cross - section of a right square pyramid that is parallel to the base? kite trapezoid triangle square question 14 (multiple choice worth 1 points)
Answer
### Question 12
# Explanation:
## Step1: Recall density - mass - volume formula
The formula is $\text{Mass}=\text{Density}\times\text{Volume}$.
## Step2: Substitute given values
Given $\text{Volume}=2200$ m³ and $\text{Density}= 0.1785$ kg/m³. So, $\text{Mass}=0.1785\times2200$.
## Step3: Calculate the mass
$0.1785\times2200 = 392.7$ kg.
# Answer:
$392.7$ kg
### Question 13
# Brief Explanations:
When a cross - section of a right square pyramid is parallel to the base, the shape of the cross - section has the same shape as the base. Since the base of a right square pyramid is a square, the cross - section parallel to the base is also a square.
# Answer:
Square