exam Maths Puzzle Numerical Ability

please help me solve this equation (4y-9=15)

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exam Other Question

Use Property 1 to simplify each of the following radical expressions. Assume that all variables represent positive real numbers.
√72x^3
This is suppose to be a radical sign √ but this is as close as I could get. Could you please help me simplify the following expressions by combining like terms:

1. 7c + 14d + d - 5c
2. u + u - 4 - 3u + 1
3. -4x + 11 - 6x - 5
4. 9y + 6 + 4y - 2x

Thank you.