book Maths Puzzle Numerical Ability

A certain noise produces 3.49x10^-5 watts/mt of power. What is the decibel?

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I need your help on this one.................Choose the equation of the parabola that opens to the right, has the vertex
(-3,4) and goes through the points (5,-4).
a. (y+4)^2=4 how do u find the surface area and volume of a right solid with a base of 10, radius of 4 (a semi-circle on the side) and height of 40 ft.? i think the formula is ph+2b for the sur