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
Answer:
x = 12.
Step-by-step explanation:
2x + 6 + 4x + 2 = 2(5x - 20) (The sum of the outer parallel sides = 2 * middle parallel line).
6x + 8 = 10x - 40
48 = 4x
x = 12.
Answer:
sorry i don't know this one but im sure other people would under stand im actually trying to figure out similar problems
Step-by-step explanation: sorry i didn't know this answer
1. 103-22 = 81
2 10.2-3y+2x is already in simplest form
