M + 5f = 25....multiply by -1
m + 10f = 40
----------------
-m - 5f = -25 (result of multiplying by -1)
m + 10f = 40
-----------------add
5f = 15
f = 3
m + 10f = 40
m + 10(3) = 40
m + 30 = 40
m = 40 - 30
m = 10
so the membership fee (m) = 10 and the sessions(f) = 3
Answer:

Step-by-step explanation:
The volume of a cylinder is:

where
is the radius and
is the height.
The height is 4 inches greater that the radius, so:

Substituting this in the formula for volume:

the volume is 
thus:

Dividing everything between pi:


We can see that the solution for this is 
since 
We have the radius, now we find the height:


Answer:
90% sure it's the third option
Step-by-step explanation:
given ,
a circle of radius 12 inches
and
= 45°
now we know that ,

let's now plug in the values of radius and theta as 12 inches and 45° respectively ,

hope helpful :D