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mafiozo [28]
3 years ago
9

The table below shows the amount of a radioactive compound remaining after X years Sarah is compiling the data into a lab report

including a graph and needs to determine what scale to use which statement is true about her data.
A. the y-intercept of the graph is 900, and the X increases, f(x) approaches 100.
B. the amount of radioactive substance will continue to Decay at a constant rate over time until it reaches the x-axis.
C. the y-intercept of the graph is 900, andaz x increases, f(x) approaches infinity.
D. the x-intercept of the graph is 900, and as X increases, f(x) approaches 100. ​

Mathematics
1 answer:
Murrr4er [49]3 years ago
9 0

Answer:

  A. the y-intercept of the graph is 900, and as X increases, f(x) approaches 100.

Step-by-step explanation:

The table can be described by the function ...

  f(x) = 100 +800·2^-x

This is an exponential decay (not a constant-rate decay) from a y-intercept of 900 down to a minimum value of 100 (not zero).

The best description is that of choice A.

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Calculate the total surface area of a pipe with inner surface area 1508.5 square cm, outer surface area 2514.2 square cm, and in
algol [13]

Answer:

The total surface area of the pipe is 4123.31 cm²

Step-by-step explanation:

Total surface area (TSA) of a pipe is calculated as;

Outer area of the pipe + Inner area of the pipe + cross section of the two ends

TSA = 2πRL + 2πrL + 2π(R² - r²)

TSA = 2π(RL + rL + R² - r²)

where;

R is the outer radius

r is the inner radius

L is length of the pipe

Determine the length of the pipe

Outer surface area of the pipe is  calculated as;

outer surface of the pipe = 2πRL

2514.2  = 2πRL

2514.2 = (2π x 5) L

2514.2 = 31.42 L

L = 2514.2 / 31.42

L = 80.02 cm

Finally, determine the total surface area of the pipe

TSA = 2π(RL + rL + R² - r²)

TSA = 2π(5x80.02 + 3x80.02 + 5² - 3²)

TSA =  2π(400.1 + 240.06 + 16)

TSA =  2π(656.16)

TSA = 4123.31 cm²

Therefore, the total surface area of the pipe is 4123.31 cm²

8 0
4 years ago
Carol is going to buy a purse she found. It is originally $120.00, but has been marked down 25%. When carol goes to buy the purs
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$97.2


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5 0
4 years ago
Solve the following equation. Then place the correct number in the box provided. x/8=.42
Anuta_ua [19.1K]

Answer: 3.36

Step-by-step explanation:

hello. My name is Mary. I am in 7th grade.

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3 years ago
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Answer:

Reflection over the x-axis

Step-by-step explanation:

To get from Triangle A to Triangle B, Triangle A must be reflected over the x-axis. On Triangle A, the left-most point is at (1, -2). The corresponding point on Triangle B is at (1, 2). The rule for reflecting over the x-axis is (x, y) -> (x, -y). So, (1, -2) -> (1, 2).

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3 years ago
Jamal borrowed $15 600 for 6 years from a bank. The annual simple interest rate for the first 3 years is 1.6%. From then onward,
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Answer:

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Formula for simple interest =

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Since the first three years is 1.6% interest we can write:

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2 years ago
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