Which one do I put in the red circle ?

The third one

Step-by-step explanation:

The key signature is 2 therefore it has to be worth 2 beats.

The first 2 and last one lasts only 1 beat.

Therefore, you are only left with the third one that lasts 2 beats.

Hope this helps :)

£56

step-by-step explanation:

u divide 24 by 3 and u get 8 so if u do 8 time 7 or 8+8+8+8+8+8+8 u get 56 and 56 divided by 7 is 8.

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.