5x+2y=9, and 5x+10y=75,

Multiplying an even number of negative numbers gives an answer that is choose from:

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

Solve for x and select the correct answer