In an algebraic question like 3(x^4)^5, do you add the variables together?

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

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Can someone me with this? i’m not sure what to put for my equations.