Pls help ill mark brainliest

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

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2