The answer is 8.513 which is to 3 decimal places
Answer:
1. x = 36
2. x = -2, x = 5
Step-by-step explanation:
Secant - Secant Power Theorem: 12(12 + x) = 10(18)
144 + x = 180
x = 36
Chord - Chord Power Theorem: (x - 2)(x + 7) = 4(2x - 1)
x^2 + 5x - 14 = 8x - 4
x^2 - 3x - 10 = 0
Factor:
(x + 2)(x - 5) = 0
x = -2, x = 5
Answer:
82
Step-by-step explanation:
Answer:
8.3
Step-by-step explanation:
Let Ao be the original amount and A the amount after t days.
Then we have the exponential function
A = Ao(1 - x)^t or
A/Ao = (1 - x)^t
When t = 8, A/Ao = 0.5
0.5 = (1 - x)^8
(0.5)^(1/8) = 1 - x
0.917 = 1 - x
x = 1 - 0.917 = 0.083 = 8.3 %
The substance decays by 8.3 % each day.