help with yr8 math

[dawn aspen]

i’m a little dumb so thers3 problems

[silver cloak]

Okay so for the first one

question 6 irene one

So assume that she does x questions correctly

This gives us that she does 30-x questions wrong

[dawn aspen]

okay

and then what do we do next-

[silver cloak]

Okay

So now we know that she does x questions correct, so it means she gets how many marks?

Think about it

She gets 2x marks because each question gives her 2 marks, so x questions is 2x marks

And now we know she does 30-x questions wrong

So we subtract 1(30-x), which is 30-x, because she loses 1 mark for each wrong question

So 2x-(30-x) is the amount of marks she gets

And the question has given her she gets 21 marks

[olive lichen]

@dawn aspen

For problem solving set 44

Do you notice a pattern in the numbers

Like how much they increase by?

For problem 3

The triangle problem

Let’s call the smallest side x

Then the other sides are x + 14 and x + 30

Then use triangle inequality theorem to find the smallest value of x

And plug x back into the sides to get your answer

[dawn aspen]

what’s that- i think i gotta learn more

[olive lichen]

So basically

The smallest two sides have to be greater than the biggest side

[dawn aspen]

ohhh

[olive lichen]

Otherwise their lengths would not be able to reach the length of the biggest side

And it wouldn’t be a triangle

[dawn aspen]

i seee okauoayy

but what abt the set 44 one q1

i think they all multiples of 3 but in the multiplex choice there isn’t any answer that matches

[olive lichen]

Looking for addition patterns

They all add by a constant