Check whether the given value of x is a solution to the equation. (x+4) = 20 where x = 48

Is the given value of x a solution to the equation?

If f(x)= 3x+6 which of the following is the inverse of f(x)

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.