The system of equations will be:
<h3>How to explain the euation?</h3>
The slope = (-2 - 3) / (1 - 2) = -5/-1 = 5
Uin y = mx + b
slope(m) = 5
(2,3)...x = 2 and y = 3
Now sub into the formula
3 = 5(2) + b
3 = 10 + b
3 - 10 = b
-7 = b
The equation is : y = 5x - 7 or 5x - y = 7
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Answer:
Step-by-step explanation:
Lets find out first the Area of the rectangle building
A=50*100=5000 ft^2
we have 2 circles with the radius of 42 ft, r=21ft
Acircle=3.14*(21)^2=1384.74
Area of 2 circles=2*1384.74=2769.48
What is not covered by the rings is
5,000.00-2769.48=2230.52, rounded is 2231
Choice A
He has 4 choices
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Answer:
B
Step-by-step explanation:
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