im silly and need help

a square has lengths (7x-3) and 3(x+1).
find x

Should be fairly straightforward, what are you stuck with?
Obviously, if its a square, both sides have the same length ...

Reply 2

mqb2766

Original post by RazzzBerries

7x - 3 = 3x + 3

7x = 3x + 6

4x = 6

x = 6/4

Maths is definitely NOT my thing. If this was a massive fail, I'm so sorry. Hopefully this bumps the thread so a good mathematician can check if I'm right or talking complete shizzle.

Even for simple problems like this, the aim is to try and get the OP to do the working. They'll learn more that way.

As an aside though, if you're unsure about your answer, sub it back into the original equation and check that both sides are equal. That will tell you whether you have made a mistake or not.

Reply 3

RazzzBerries

Chat Forum Helper

Original post by mqb2766

OK, I'm sorry. I thought I might try it and see whether OP would make any sense from my working, but you are right.

Thank you.

Reply 4

sunflower69

Original post by mqb2766

Should be fairly straightforward, what are you stuck with?
Obviously, if its a square, both sides have the same length ...

oh yea its a square, told you i was silly

Reply 5

sunflower69

theres another q that im not sure about

70 students eat only an apple or only a banana. 4/5 of these 70 students eat only apples. The number of students that eat apples is three times the number that eat bananas. Complete the Venn Diagram

so 4/5 of 70 = 56 number of people in the apple circle
70 - 56 = 14 number of people in banana circle

how do you work out the number of people in the overlap?

Reply 6

SS__

Original post by sunflower69

With the question you gave, there is no middle. You said 70 students eat ONLY an apple or ONLY a banana, so there isn’t any students that eat both. Correct me if I’m wrong

Reply 7

username3249896

Original post by sunflower69

let the part which overlaps be x
hence solve for x

(edited 5 years ago)

Reply 8

username3249896

volume of pyramid = 1/3 base area x perpendicular height

Reply 9

username3539714

Original post by sunflower69

Attachment not found

Mate, is this your homework you’re getting people to do? 😂

(edited 5 years ago)

Original post by sunflower69

At least try yourself then we'll guide you.

Reply 12

sunflower69

BD^2 = 12^2 + 12^2 = 288

1/2BD^2 = 144

25^2 - 144 = h
h = root 481

1/3 base x height
1/3 144 x root 481 = 1050cm^3 (3sf)

where did i go wrong tho

Reply 13

Randilicious

Original post by sunflower69

BD^2 = 12^2 + 12^2 = 288

1/2BD^2 = 144

25^2 - 144 = h
h = root 481

1/3 base x height
1/3 144 x root 481 = 1050cm^3 (3sf)

where did i go wrong tho

As bolded.

Reply 14

Muttley79

Original post by RazzzBerries

Maths is definitely NOT my thing. If this was a massive fail, I'm so sorry. Hopefully this bumps the thread so a good mathematician can check if I'm right or talking complete shizzle.

Please edit your post - full solutions are not allowed - please read the rules :smile:

Reply 15

Muttley79

Original post by BobbJo

it's not 56 in the apple circle
it's 56 in the part of the apple circle which doesn't overlap with the banana circle

Please stop posting full solutions.

Reply 16

username3249896

Original post by Muttley79

Please stop posting full solutions.

not a full solution i didnt give the value of x. btw I don't ever post full solutions. "stop posting" implies everytime I answer a question I post a full solution. this is fake. i'm just trying to help people.