exam Maths Puzzle Numerical Ability

state the number to replace ? a + 3a= 1a = 3a = (1 + ?) a

Distributive property

Thank you

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exam Other Question

If y varies inversely as x^2, and y=2 when x=4, what is the constant of variation? I cannot figure out how to solve this quadratic equation.
Solve for x:

2x^2 + 3bx + b^2 = 0

Thank you,
Melody Salzer