Answer: Option A
About 0.02 pounds
Step-by-step explanation:
We know that density is defined as:
Where
d is the density
m is the mass
v is the volume
We want to calculate the helium-air mass of a spherical balloon and we know its density and the diameter of the balloon.
Then we can calculate its mass.
1) We use the diameter of the spherical globe to calculate its volume.
The volume of a sphere is:
and
So
2) Use the density formula to find the mass
<em>The answer is 0.02 pounds</em>
Answer:
The average age was minimum at 1954 and the average age is 25.5.
Step-by-step explanation:
The given quadratic function is
It models the median, or average, age, y, at which men were first married x years after 1900.
In the above equation leading coefficient is positive, so it is an upward parabola and vertex of an upward parabola, is point of minima.
We need to find the year in which the average age was at a minimum.
If a quadratic polynomial is , then vertex is
54 years after 1900 is
Substitute x=54 in the given function.
Therefore, the average age was minimum at 1954 and the average age is 25.5.