exam Maths Puzzle Numerical Ability

In your day to day life think about relationships between varibles.

1. Choose a relationship between two varibles that you think is linear.

Pick 5 or 6 real life data point

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exam Other Question

My homework tells me to prove an identity, sin(x-3 times pie divided by 2)=cosx

I cant figure it out please help
I am not sure I have worked this problem correctly could you please help?

Solve the system by addition...

-2x + 3y = -15
x - 2y = 11

Thank you for your help.