Mrs. King has 3 3/4 yards of fabric she uses 1 7/8 yards to create a blanket and 1/2 yard to make a pillow.how much fabric does
1 answer:
- Total number of fabric Mrs. King has =
- Number of yards of fabric used for a blanket =
- Number of yards of fabric used to make a pillow =
- To find the number of yards of fabrics Mrs. King has left, we apply the operations of Addition and Subtraction
- Step 1 : Addition Operation
Total number of fabrics used by Mrs. King = Fabric used for blanket + Fabric used for pillow
=
- Step 2 : Subtraction Operation
Total number of yards of fabric left = Total number of fabrics - Total number of fabrics used
=
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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