10/09/21

How is this problem onto?

f: Z → Z f(x) = 2x + 34Can someone tell me how this is onto? I miss this question on the quiz and the answer was one to one and onto. I do not understand why it is onto. I only see this f(x) or y =... more

Is this website correct about p(∅)?

I am learning about power sets.I know that p(∅) = {∅} or {{}}.That is a little confusing to me, so I used an online calculator (https://www.mathsisfun.com/sets/power-set-maker.html). After putting... more

02/13/21

discrete maths direct proof

16. Prove that if a and b are positive integers, then a/b + b/a ≥ 2.

02/13/21

How fast is the height of the pile increasing when the pile is 22 feet high?

Gravel is being dumped from a conveyor belt at a rate of 50 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal. How fast is... more

02/12/21

Use iteration to guess an explicit formula for the sequence and use mathematical induction to verify the formula obtained:

Pk = Pk-1 + 2 * 3k, for each integer K ≥ 2, where Pk = 2

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