A 40 gram sample of a substance that's used for drug research has a k-value of
0.1472.
N = Noe
-kt
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

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

something over 10 so ? /10

step-by-step explanation: