exam Maths Puzzle Numerical Ability

Could you please show me how this problem would look on paper?
9t<= -8.1 My homework says to solve.Then graph

I can do some of the simple ones like: y-9>-18

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exam Other Question

This question is not from a text book.
I am trying to find the standard deviation for this set of data. 75,65,50,90,80,60,70,85,80,85. The answer that i came up with is 42400 divide by 10. is this the way how?
Thank you so much for your help. write an equation for the line containing each pair of points

(-2,-4) , (5,-1)