I hope this helps you
2pi.r=C
r=C/2pi
The measure of XYZ is:
C. 120
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
Congruent
SSS (because of Pythagoras)
I think it’s 311.75?
i added the closing balances and divided by the 4 selected days
either that or 44.54 if you divide by 28 days of February instead…
i might be wrong though
