Answer:
c
Step-by-step explanation:
because it's her extraneous uncontrolled variable
Subtract 3 both sides first. R-3=ts²
next, divide both sides by t, (R-3)/t=s²
finally, take the square root of both sides
√(R-3)/t = s. 2nd choice.
19% is 19/100 and there is nothing that can go into these numbers evenly so this is the simplest form
