exam Maths Puzzle Numerical Ability

1. y(y*5)(wy)

2. |6-3.7|+|7-(5-2)|

3. 8-3|5-16+1|

This is my first Algebra course. Kindly assist me. Thank you

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exam Other Question

can you please help me find x?
2X10^-5 = (1+0.23x)^-3
Thank you in advance.
I have to multiply using the vertical method. Can I get some assistance and somebody to explain how the process is done?

(2r - 3s)( 4r^2 + 6rs + 9s^2)

Thanks.