Solve 10 is less than or equal to negative 5 minus seven

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Ill mark the brainliest if you me with the these three questions 7,8,9

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