exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Explain what the value of the discriminant means to the graph of y = ax2+bx+c=0.
Hint: Chose values of a,b, and c to create a particular discriminant. Then, graph the correspondi 5sqrt8 plus sqrt98 - 2sqrt18