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


discrete maths direct proof

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


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


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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