exam Maths Puzzle Numerical Ability

YOLANDA IS MAKING STAICASE SHAPES BY USING SQUARE TILES.HOW MANY TILES WILL SHE NEED TO MAKE A STAIRCASE THAT IS 10 TILES TALL?

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exam Other Question
9g + 7h = 9g - 7h + g Could someone explain how to solve this problem by multiplying?

8 x a^3+64
___________
3a+12 x 12
Thanks