Answer:
Step-by-step explanation:
In this problem we have a exponential function of the form
where
f(x) is the remaining mass of the element in grams
x is the time in minutes
a is the initial value (y-intercept of the exponential function)
b is the base
r is the rate
In this problem we have
---> is negative because is a decay's rate
substitute
The exponential function is equal to
For x=15 minutes
substitute in the function
The answer is A because 9x times 0 = 0 and 3y times -6 = -18
Well for me it will be 2 3/8 × 1/3 = 19/8 × 1/3 = 19/24. 19 ÷ 24 = 0.791666666 estimated = 0.79166667=0.7916667=0.791667=0.79167=0.7917=0.792=0.8=1. so the answer is 1
We know that the angle in a straight line is 180 degrees.
Therefore,
40x - 4y = 180 (1)
20x + 16y = 180 (2)
Multiply (1) by 4, we get,
160x - 16y = 720
20x + 16y = 180 (from (2))
Adding, we get,
180x = 900
Substituting in (1), we get,
40(5) - 4y = 180
200 - 4y = 180
-4y = 180 - 200
-4y = -20