A 41 gram sample of a substance that's used to detect explosives has a k-value of 0.1392 N = Noel -kt No = initial mass (at time t = 0) N = mass at timet k = a positive constant that depends on the substance itself and on the units used to measure time 6 = time, in days​

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$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.

a

step-by-step explanation:

the correct answer is $7.38

step-by-step explanation: