Expample write 0.81 in simplest form. the answer to 0.81 is 9/11 i need with these three

1. 0.5
2. 0.63
3. 0.214

What is the inverse of the function f(x)=4x+8

What is the range of the data below? .8090100

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