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Alecsey [184]
2 years ago
14

A grain of rice average weight is about 25 milligrams or 0.025 grams. Which of the following shows the weight in grams in scient

ific notation?
2.5x {10}^{2}
2.5x {10}^{ - 2}
0.25x {10}^{1}
0.25x {10}^{ - 1}
​
Mathematics
1 answer:
zavuch27 [327]2 years ago
4 0

Answer:

2.5x10⁻2

Step-by-step explanation:

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One leg of a 45°-45°-90° triangle measures inches. What is the length of the hypotenuse?
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Answer:

each leg of the right triangle = 12√2

Step-by-step explanation:

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On Dan's eReader, 2/3 of the books are fiction. Of the fiction books,4/5 are mysteries. What fraction of the books on Dan's eRea
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Answer:

Step-by-step explanation:

Let's take a real situation. Suppose he has 1500 books in total

2/3 of them are fiction. Of means multiply.

them = 1500

2/3 * 1500 = 3000/3 = 1000

Now of the one thousand fiction books 4/5 of them are mysteries.

4/5 * 1000 = 4000/5 = 800.

Now let's see what happens when we just do this by answering the question directly.

2/3 * 4/5 = 8/15 This has the meaning that 8 out of every 15 books = mysteries.

Try this on the 1500 books.

8/15 * 1500 = 9000/15 = 800. So the answers are the same and the answer the computer expects should be 8/15 or 0.533333333

Just to check, does 0.5333333 * 1500 = 800? Try it.

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3 years ago
If your starting salary is $50,000 and you receive a 4% increase at the end of every year, what is the total amount, in dollars,
Anika [276]
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3 years ago
a ladder 5 meters long is leaning against a wall. the base of the ladder is sliding away from the wall at a rate of 1 meter per
Kruka [31]

Complete question :

a ladder 5 meters long is leaning against a wall. the base of the ladder is sliding away from the wall at a rate of 1 meter per second. how fast is the top of the ladder sliding down the wall at the instant when the base is 4 meters from the wall?

Answer:

-4/3 m/s

Step-by-step explanation:

Using Pythagoras :

a² = x² + c²

5² = x² + y² - - - (1)

The horizontal distance x with respect to time t = 1m/sec

dx/dt = 1m/sec

To obtain the vertical height 'y' with respect to time t when x = 4

5² = x² + y²

Wen x = 4

5² = 4² + y²

25 = 16 + y²

y =√(25 - 16)

y = 3

Differentiate (1) with respect to t

x² + y² = 25 - ---- - (1)

2x * dx /dt + 2y dy/dt = 0

dx/dt = 1

x = 4.

y = 3

2(4)(1) + 2(3) * dy/dt = 0

8 + 6dy/dt = 0

6 dy/dt = - 8

dy/dt = - 8/6

dy/dt = - 4/3

8 0
3 years ago
I need help on #2 I want to know if it’s right
anastassius [24]
I would’ve gone with the same choice so I think it’s right!!
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3 years ago
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