The answer is 28 years
At = A0 * e^(-k * t)
At = 12 g
A0 = 15 g
k = 7.9 × 10^-3 = 0.0079
t = ?
12 = 15 * e^(-0.0079 * t)
12/15 = e^(-0.0079 * t)
0.8 = e^(-0.0079 * t)
Logarithm both sides (because ln(e) = 1:
ln(0.8) = ln(e^(-0.0079 * t))
ln(0.8) = (-0.0079 * t) * ln(e)
-0.223 = -0.0079 * t
t = -0.223 / -0.0079
t = 28.23
t ≈ 28 years
The term reliability in psychological research refers to the consistency of a research study or measuring test. For example, if a person weighs themselves during the course of a day they would expect to see a similar reading. Scales which measured weight differently each time would be of little use.
Answer: He bought 7 pens.
Step-by-step explanation:
21/3 = 7
Answer: y3−1y3=234
Step-by-step explanation:
y−1y=6
(y−1y)3=63
y3−3y+3y−1y3=216
y3−1y3=216+3(y−1y)=216+3(6)
not sure:)
Wooo Yes Yes Yes Yes the triangles r congruent