exam Maths Puzzle Numerical Ability

w=gh-3gt^2
solve for g

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exam Other Question

Solve by the elimination method.
3x + 4y = 3
6x + 8y = 6

Can someone please help me with this. I was doing really well with my work but now am stuck again. Help me please.
Find the sum of the first thirty terms of the following arithmetic series:
16+25+34+43...