Answer:
Given that,
The number of grams A of a certain radioactive substance present at time, in years
from the present, t is given by the formula

a) To find the initial amount of this substance
At t=0, we get


We know that e^0=1 ( anything to the power zero is 1)
we get,

The initial amount of the substance is 45 grams
b)To find thehalf-life of this substance
To find t when the substance becames half the amount.
A=45/2
Substitute this we get,


Taking natural logarithm on both sides we get,







Half-life of this substance is 154.02
c) To find the amount of substance will be present around in 2500 years
Put t=2500
we get,




The amount of substance will be present around in 2500 years is 0.000585 grams
First find which value you would like to round up or down
second if the number is less than five round down, if the number is more than five round up
hope this helps
Well, think of a fraction. The numerator is telling what how many you have and the denominator is the total amount available. A fraction can be written as a/b, or whatever how much value a you have out of the total amount you can have. So if you have 3 apples out of the available 3 apples, you have 100% of the apples. So the attritibutes are a/b when a and b are the same value, and when dividing fractions, when you divide by the reciprocal.
Answer:
Step-by-step explanation:
What graph
Answer: The answer is y=9 i did the math twice to make sure.
Step-by-step explanation: