Answer:
Is this a question from school or from ur mind
So you just plug in 3 into variable p in the equation. C=12(3)+5
C=26+5
C=31
Answer:
339.12 cubic millimeters
Step-by-step explanation:
The picture of the question in the attached figure
we know that
The volume of the figure is equal to the volume of the two hemispheres (one sphere) plus the volume of the cylinder
so
step 1
Find the volume of the cylinder
The volume is given by

where
B is the area of the base of cylinder
h is the height of cylinder
we have

we have

----> the radius is half the diameter


substitute

step 2
Find the volume of the sphere
The volume is given by

we have
----> the radius is half the diameter
substitute

step 3
Adds the volumes

Answer:
A sample of 217 is needed.
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find the margin of error M as such

In which
is the standard deviation of the population and n is the size of the sample.
If the population standard deviation is $3,750 how large should the sample be if margin of error is $500
We have that
.
We need a sample of n, and n is found when
. So






Rounding up
A sample of 217 is needed.
First, we have to work out the area of the backyard using the formula base times height
a=12*10. So, the area of the yard is 120.
Then, we have to work out how much grass seed we need, so we put all values in a ratio
120=x
400=25.99
The, you ask yourself what do I have to divide by 120 to get 400 ( and you do this by dividing 120/400 which is 0.3)
The, you also multiply 25.99 by 0.3 to find out how much grass seed you need.
So, to cover an area of 120yd^2, you need $7.80 worth of grass seed