If you have

as your cost,
and you paid

,
then

.
Thankfully, most cellphone companies don't charge for minutes anymore!
Answer:
Step-by-step explanation:
What we're looking for here is the volume of this ball, which is the volume of a sphere:

If our diameter is 3, then the radius is 1.5:

In terms of π, the solution is
which can also be expressed as 
Or if you have to multiply in the pi, the solution is
V = 14.14 cubic inches
Answer:
k=9
Step-by-step explanation:
First find r=22/20=1.1
The sum of the first k terms formula is a1•(1-r^k)/(1-r)
a1=20 and the sum is 271.59
Now plug in these values in the formula and find k.
271.59=20(1-1.1^k)/(1-1.1)
When you simplify this equation, you will get k=ln(2.358)/ln(1.1)
k=9
Answer:
Step-by-step explanation:
Triangle ABC is a right angle triangle that is made up of 2 right angle triangle.
To determine y, we would apply Pythagoras theorem which is expressed as
Hypotenuse² = opposite side² + adjacent side²
15² = y² + 12²
225 = y² + 144
y² = 225 - 144 = 81
y = √81 = 9
To determine z,
20² = z² + 12²
400 = z² + 144
z² = 400 - 144 = 256
z = √256 = 16