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Hatshy [7]
3 years ago
6

You are carpeting a rectangular room that is 3.5 yards by 4.5 yards. The carpet costs $15 per square yard. How much will it cost

to carpet the room?
Mathematics
1 answer:
skad [1K]3 years ago
3 0
I think it's 120 but I might be wrong
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Plutonium–238 has a yearly decay constant of 7.9 × 10-3. If an original sample has a mass of 15 grams, how long will it take to
eduard
The answer is 28 years

At = A0 * e^(-k * t)
At = 12 g
A0 = 15 g
k = 7.9 × 10^-3 = 0.0079 
t = ?

12 = 15 * e^(-0.0079 * t)
12/15 = e^(-0.0079 * t)
0.8 = e^(-0.0079 * t)

Logarithm both sides (because ln(e) = 1:
ln(0.8) = ln(e^(-0.0079 * t))
ln(0.8) = (-0.0079 * t) * ln(e)
-0.223 = -0.0079 * t
t = -0.223 / -0.0079
t = 28.23
t ≈ 28 years
8 0
3 years ago
21 POINTS!<br><br> what is value of x?
defon

Answer:

5

Step-by-step explanation:

Using the Pythagorean theorem:

a^2 + b^2 =  c^2

3^2 + 4^2 = c^2

9 + 16 = c^2

c^2 = 25

c = 5

4 0
3 years ago
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Convert 5/-6 to decimal<br>​
Paladinen [302]

-0.83 because that's the way to go

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Please help me
Flauer [41]
Probability of heads or tails is .5
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5 0
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A person makes 300 dollars a month babysitting. If they
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Answer:

They will save $90 each month

Step-by-step explanation:

300*30%

or

300*.3

90

7 0
3 years ago
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