lam supposed to recover a 60.0 ppm (parts per million) concentration of matrix spike after running an assay (procedure). I ran the assay 4 times and got concentrations of 42.6 ppm, 43.5 ppm, 41.9 ppm, and 42.3 ppm. Are my results accurate? Precise? Why?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Provide a stepwise curved arrow mechanism that fully explains the outcome of the reaction shown below. oh нао* heat он

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.