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Rasek [7]
3 years ago
12

Is the square root of 400 rational or irrational

Mathematics
2 answers:
STatiana [176]3 years ago
6 0

Rational number, because the Square root of 400 is 20, since 20 x itself is 400. Hope this helps!

Alex_Xolod [135]3 years ago
3 0

The square root of 400 is rational because the product is 20 which is a whole number making it a rational number

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3 years ago
Mark can remember only the first 4 digits of his friend's phone number. He also knows that the number has 7 digits and that the
denis-greek [22]

Answer:

<em>19800 seconds, or 330 minutes, or 5 hours + 30 minutes</em>

Step-by-step explanation:

<u>Number Permutations</u>

We know the phone number has 7 digits, 4 of which are known by Mark. This leaves him 3 digits to guess with. We also know the last one is not zero. The number can be represented as

XXY

Where X can be any digit from 0 to 9 and Y can be any digit from 1 to 9. The first two can be combined in 10x10 ways, and the last one can be of 9 ways, this gives us 10x10x9 = 900 possible permutations.

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3 0
3 years ago
The diameter of a circular tablecloth is 72 inches. Find the area and circumference. Use 3.14 as an approximation for pi.
nalin [4]

Answer:

Part 1) The area is A=4,069.44\ in^{2}

Part 2) The circumference is C=226.08\ in

Step-by-step explanation:

step 1

Find the area

we know that

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A=\pi r^{2}

we have

r=72/2=36\ in ------> the radius is half the diameter

\pi =3.14

substitute

A=(3.14)(36)^{2}

A=4,069.44\ in^{2}

step 2

Find the circumference

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C=\pi D

we have

D=72\ in

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substitute

C=(3.14)(72)

C=226.08\ in

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Answer:

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3 years ago
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