Situation: Find the substance's half-life, in days.
Round your answer to the nearest tenth.
A 40 gram sample of a substance that's
used for drug research has a k-value of
0.1472.
Enter the correct answer.
N=Noe
DONE
No - initial mass (at time t = 0)
OOC
0
OO
N = mass at timet
k = a positive constant that depends on
the substance itself and on the units
used to measure time
t = time, in days

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )