Pls help I need to find x

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Which point is a solution to y s 4x + 5?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days