exam Maths Puzzle Numerical Ability

Simplify the following:
1 3x2 + 4x + 3x2 - 4y

2. (5x - 2y) - (4x + 8y)

3. 3x3(2x2)

4. (-6a3b4)2
Can you PLEASE HELP ME WITH THESE! THANK YOU SO MUCH

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exam Other Question

write each number in a standard notation

9.3 x 10^-5
Hi sir , can u pls help me with this sum
Simplify:-
4x^2-4x-15/10x+15 divided by 4x-10/x+2 X x^2+4x+4/4x+8
X= Multiplied by
THANKS