Answer: A.n = 4/7
have:
Step-by-step explanation:
Answer:
0.00325
Step-by-step explanation:
0.325/100
Answer:
the question is incomplete, so I looked for a similar one:
<em>After the release of radioactive material into the atmosphere from a nuclear power plant, the hay was contaminated by iodine 131 ( half-life, 8 days). If it is all right to feed the hay to cows when 10% of the iodine 131 remains, how long did the farmers need to wait to use this hay? </em>
iodine's half life (we are given x, we need to find b):
0.5A₀ = A₀eᵇˣ
x = 8 days
we eliminate A₀ from both sides
0.5 = eᵇ⁸
ln 0.5 = ln eᵇ⁸
-0.69315 = b8
b = -0.69315 / 8 = -0.08664
since the farmers need to wait until only 10% of the iodine remains (we already calculated b, now we need to find x):
0.1A₀ = A₀eᵇˣ
0.1 = eᵇˣ
ln 0.1 = bx
where b = -0.08664
x = ln 0.1 / -0.08664 = -2.302585 / -0.08664 = 26.58 days
Answer:
The standard form of the equation is
Step-by-step explanation:
The given circle has equation:
We regroup similar terms to obtain:
We now complete the square to obtain:
Or
This is now of the form:
which is referred to as the standard form equation of the circle:
22: 4x+8
23: 3x+21
24: 10x+35
27:39
28:48
29:36
30: 2(x+4)
32: 7(6x+7)
