For this case we have an equation of the form:
y = A * (b) ^ t
Where,
A: initial amount
b: decrease rate
t: time in years.
Substituting values we have:
7 = A * (0.5) ^ ((1/20) * t)
For t = 45 years we have:
7 = A * (0.5) ^ ((1/20) * 45)
Clearing A:
A = 7 / ((0.5) ^ ((1/20) * 45))
A = 33.3
Answer:
the density of the substance when it was deposited 45 years ago was:
A = 33.3 milligrams per square centimeter
Answer:
X=-12
Step-by-step explanation:
9-16-5=X
-12=X
X=-12
Answer:
B. (6,2) and (3,0)
Step-by-step explanation:
To find the slope the equation is 
so for (6,2) and (3,0) the equation would look like this 
which simplies down to 
and a negative divided by a negative is a positive so you're slope is 
and it matches the question.
Answer:
The input value is x=1
Step-by-step explanation:
we know that
The intersection point both graphs is the point that produces the same output value for the two functions
Observing the graph
The intersection point is (1,1)
therefore
For x=1 (input value)
The output value for the two functions is equal to 1
Answer:
1
Step-by-step explanation:
