exam Maths Puzzle Numerical Ability

This is a question that I had to redo 2! I don't know what I am doing wrong.
The question is: Draw a bar qraph illustrating the following data. The data is Educational attainment

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exam Other Question

Multiply

(2r - 3s)(4r^2 + 6rs + 9s^2)
I need help simplifying and solving the following equation for H:

A= 1/2h(a+b).


I got to 2A=ha + hb. Is this right? How do I solve for H from here?