5z+(y-z) algebraic expressions if x=6,y=8,and z=3 i need the answer fastt pls and ty

What is the value of x? enter your answer in the box. photo attached.

Whose conclusion is correct? choose all that apply. (two max) elijah emily edward esme

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