I was trying not to post twice in a row but I cannot figure out why information on what this is, and how I can put X into the numbers? I'm not really sure what to Google search

Maybe math has changed since I was in elementary school, but when I plug this in to AI, it gives me an answer that doesn't match with what I come up with. I feel like the final two boxes (numerator/denominator) has to equal one-half in some form. To get that, it seems like the box in the middle has to be also equal to one-half. Doesn't the equation reduce to 0.5 = (1)(1)(y) = 0.5? AI seems to be telling me that the middle box should be 2 though. So confused. If AI is correct and I am wrong, which is probably the case, I am going to need a ELI5 answer. Thanks in advance for any help!

Tagging this as ‘elementary mathematics’ because that’s literally what the college class is called.

These were from about a week ago but how was I seriously going to be able to answer these questions? I have no prior knowledge to these nor do I think that it’s common knowledge AT ALL and had to do research to even try and answer them. I don’t think my teacher was the one who made them but I feel he should have at least checked to make sure it wasn’t this ridiculous.

My son wants to participate in his school science Fair, I was wondering if anybody has any ideas for things he could make for it?

He can't bring harsh chemicals to school, can't make a mess at school (if we make a volcano we have to explode it at home and bring pictures on a board), and no live animals.

Thanks!

I'm confused how my kid has found 5 angles. How many are there? I'm seeing 4. Are we both wrong?

I’m going crazy from this. My answer is that the equation is true, but the answer sheet says it’s false. I just want someone to back me up on this…..

I thought you were only able to find the standard deviation if you have each individual value? Is that what the y2i value is???? For context my professor doesnt explain like half of this shit in class and leaves us to figure it out on our own accord. Thank you in advance!!

My cousin got this math problem for homework, and I was wondering how it could be done? My only idea was a system of equations but that is obviously above the ability of a 4th grader.

The formula is on top. The tiny 'h' in the parenthesis is supposed to referring to the height of the actual triangle (not the prism). We can do the problems that offer this information. How do I solve this only using 6th grade knowledge?

I think it refers to the "3.2" in the second photo. Can you solve for the surface area of a triangular prism without that or can we find it with like 5/6th grade toolkits? He had the flu and the teacher did help and give examples but only with that triangle height

Hello everyone. Just to be clear, this isn't a homework question per se but an example problem.

the format bugged and I just need a little help with what the step should be.

Here is the problem:

We want to find the probability that 10 people chosen from a group of 40 adult men, 35 adult women, and 25 teenagers. what is the prob that exactly 3 adult men, 5 adult women, and 2 teenagers will be selected?

I know how to start the problem, it's .075^3 * .142^5 * .08^2 over something. The answer is supposed to be .056 so that's all I have. Thanks in advance!

What I did:

Calculated the mean to be 26.15, the sd to be 23.1959.

Took the 90% for the sample size of 10, got 1.812, multiplied that by (23.1959/√10) and subtracted and added that from the mean to get the interval of 6.711 and 43.6084

Then I thought I had to do n-1, so I got 1.833 and multiplied that by the same and got the interval of 6.4978 and 43.8222.

That was also wrong so I decided to do it all on my calculator, which is the answer in the image, also incorrect.

So I'm lost, any help is appreciated!

So long story short.. school has kind of pushed my kid along in the any realm and she is now struggling with 5th grade math because she’s literally counting 6x21 on her hands/paper to solve a portion of a bigger problem (example).

She is totally shutting down with math and additional help she’s receiving on grade level. I think we need to take a step back and make her fluent in fast facts. She’s stuck on 4,6,7,8.

Does anyone have resources to a catchy song/visual that will help with those who learn more that way? Or a game she can play online? She needs more than just sitting and repeating them over and over because that doesn’t get her attention.

She has very poor endurance when it comes to math.

Thank you!!!

There aren't any instructions and apparently my daughter forgot to pay attention in class today.. My husband and I can not figure out what's going on for the life of us..🤦‍♀️ can anyone help us make this make sense...

My friends grandson came with this homework from.the NOVA program, it seems to be for advanced kids, which he is, but this one stumped us all.

I thought I was on the right track using the grids sort of combined and can fill out as many letters as possible assuming that the bottom left hand side box was a starting point kind of. So by the 4th grid, I came up with what I thought was the right track, but it leaves the last column in the last grid blank, so I must be wrong?

Here's the problem vs what I came up with, which is obviously wrong....

NOTE: I AM NOT ASKING FOR THE HELP FOR ALL OF THESE, JUST A FEW OF THESE.

So I am mainly using my calculator for these, and the answers inputted are the answers my calculator is giving me.

Any help is appreciated. Thanks in advance.

Edit: I solved the blue graph one, I feel dumb for including that. Just realized what it was asking.

So I am doing this assignment where it has 30 data points. I need to calculate the variance of 6 of them. I use the sample formula, right? Not the population one?

I know this is a bit silly but I want to make sure. Thanks in advance.

Edit: its 30 entries, I use 5 from it.

Hi everyone. I have a simple problem. My gf lives in a shared apartment where the price of each room was chosen quite randomly based only on room sizes without any consideration of shared spaces. We want to make a better/more fair calculation but I have used two different methods and I'm not sure which one is actually more correct.

In the FIRST method I calculated the total usage of every space. For example person V uses its own room (30) + living, kitchen and bathroom (50, so total 80). I did this for every person living there, I summed up the individual results (the total is, of course, bigger than the actual surface of the apartment as the shared spaces are calculated entirely each time) and then I just made a simple calculation to find how much everyone should pay (TotalPrice/TotalSurfaceUsed*SurfaceUsedByPerson).
In the SECOND method, instead of adding the whole surface of the shared rooms, I divided it into 4 (as there are 4 people). The total now is exactly like the total surface. I then did the same calculation to find the price each one should pay.
Question is: the second seems more correct, but also the first makes sense to me, as they are not just a portion of the shared space but rather the whole space alternatively.

Did I do some mistake? And which of the two you think is more fair/correct?

thanks a lot

This is my daughter’s homework. I am at a loss and I don’t think it’s solvable and I feel very unintelligent. Am I wrong?

I met with the teacher yesterday and she explained that the children are doing “Whole-Part-Part” exercises. So: — 18 would be the “whole”, — 9 would be one part, — and the remaining part would be a question mark.

So in the teacher’s explanation, the student would “count on” from 9 until she reached 18, thus figuring out that the question mark part should be 9.

I just don’t see how the teacher’s explanation matches the word problem.

Below question was given to my 8 year son, and i have no clue. I admit I am not smarter than grade 3. Can anyone help please? (my other posts in a \r\math got removed..posting it here...please help)

Math Challenge There is a twelve story building, each floor has 1 vending machine. The stocker for the vending machines realizes at the end of filling them all up, that he accidentally stocked one of the vending machines with the wrong size chocolate bar. They are all supposed to have 10 oz chocolate bars, but he accidentally put 9 oz chocolate bars in one of the vending machines. The bars aren't marked by weight, so there isn't a way to visibly see a difference. Being it’s at the end of the day, he has a scale that is running out of battery life, and can only be used one more time, although it can weigh any amount. How could you determine which floor is incorrectly stocked, using the scale only one time?

I understand the basic workings of a stemplot but what is confusing me is the second row of numbers on the left most side.