exam Maths Puzzle Numerical Ability

5sqrt8 plus sqrt98 - 2sqrt18

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SOMEONE HELP PLEASE:

y varies jointly as a and b and inversely as the square root of c. y = 48 when a = 4, b =8, and c = 36. Find y when a = 2, b = 7, and c = 16.
How do you solve and graph:
/c-4/ > 1

The c-4 is in absolute value lines.

Thank you!