What is the greatest common factor 12x^5 and 8x^3

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

Could someone me with this question i’ve been stuck on it for 20 minutes

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.