exam Maths Puzzle Numerical Ability

3x-4y2 when x=-2 and y=4

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exam Other Question

Write expression without absolute value symbols.

3x + 11
________ = 1
7

The 3x+11 over 7 are surrounded by absolute value symbols and are equal to 1.

Can anyone help
I tried to do this three times, but get lost in all the steps. Can you help me?

C(10,5)x C(15,8)
________________

C(12,11)