exam Maths Puzzle Numerical Ability

Can someone please help me with this.

Subtract

7/9 - [-13/18]

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exam Other Question

How would I solve this, write this in simplest form, and rationalize the denomenator?

3, square root sighn, two divided by 5?
1-3x
______
3x^2+14x-5

can you show me how to simplify