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2 years ago

There are 9 quilts with 18 yards . How many yards would be required for 10

1 answer:

8 0

Hello!

First, you set up a proportion : quilts / yards = 9 / 18 = 10 / x
Then, you solve for x.

x = 20

Hope this helps! If you have any further concerns, feel free to let me know!

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What is the perimeter?

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Step-by-step explanation:

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2 years ago

Parallel lines n and p are intersected by transversal lines q and m as shown in the figure below. Lines q, m, and p intersect at

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Is the question where they intersect? If so which points?

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2 years ago

A woman 38 years old has a daughter 14 years old. How many years ago was the woman 8 times older than the daughter?

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Answer:

112 years ago

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Read 2 more answers

You have 480 grams of a radioactive kind of samarium. If its half-life is 90 years,

lisov135 [29]

Answer:

120 grams will be left after 180 years.

Step-by-step explanation:

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by

$N(t)=N_0(\frac{1}{2})^\frac{t}{t_{1/2}}$

where,

$N(t)$ = quantity of the substance remaining

$N_0$ = initial quantity of the substance

$t$ = time elapsed

$t_{1/2}$ = half life of the substance

From the information given we know that:

The initial quantity is 480 g,
The half-life is 90 years,
180 years is the time elapsed.

And we want to find how much will be left. For this we use the above formula.

$N(t)=480\left(\frac{1}{2}\right)^{\frac{180}{90}}\\\\N(t)=480\left(\frac{1}{2}\right)^2\\\\N(t)=480\cdot \frac{1}{2^2}=120$

120 grams will be left after 180 years.

3 0

2 years ago