Hay guys, i really need this formula for my test. the question is.
if u sub n+1= 40, and u sub n-1=10. what is the value of u sub n.

That depends on what is supposed to be. Most likely it refers to some sequence.

If is arithmetic, then each term in the sequence differs by a constant so that

Then

and we find

and so

On the other hand, if is geometric, then consecutive terms are scaled by some constant so that

Then

so there are two possible values for ,

If is some other type of sequence entirely, then this question would be impossible to answer without more information...

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere