So just plug in the 4 wherever you see an x. so it is f(4)=2(4)
Last question of a really important test! I really need some help!
A hollow ball is made of rubber that is 1 centimeter thick. The ball has a radius of 5 centimeters at the outside surface.
What is the approximate volume of rubber used to make the ball?
Use 3.14 for pi.
255.4 cm³
The first picture represents the elements in B that are not (also) in A. So, we want the set difference of B and A:

For the second picture, we can work like this: if we take all the elements belonging to A, we only need to add the bottom-right part, which is the intersection of B and C. So, we can express the blue part as

Answer:
Step-by-step explanation:

Here is the exact construction of √40 using Pythagorean 's theorem