exam Maths Puzzle Numerical Ability

Please help explain and show what is the decibel level of a normal conversation, 3.2 x 10-^2 watt per meter^2?

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exam Other Question

Solve the system of equations by graphing. Then classify the systems as consistent or unconsistent and the equations as dependent or independent

3u+v=15
3u+v+33
Determine whether the equation is an identity, a conditional equation, or inconsistent equation.

2x-3+9x-4=3x+8x-10