Identify the decimals labeled with the letters A B and a C

Can someone answer this question? : )

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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