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

I'm trying to prove Corollary 3. "In a triangle, there can be at most one right angle or obtuse angle." I can prove there can be only one right angle but how do you do the two co Please help me solve this inequality, graph the solution set, and write in interval notation.

x+6<3(x+4)