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Mashutka [201]
3 years ago
7

A.US phone numbers traditionally do not start with a zero or a one, otherwise there are no other restrictions, so how many 7 dig

it phone numbers are possible?
B.Some cities have now required you to dial area codes first. For example in Chicago we either dial 773 or 312, so now how many possible Chicago Phone numbers are there?

C.Why have cities and suburbs have added on these area codes in recent years?
Mathematics
1 answer:
algol [13]3 years ago
7 0
Number of ways of choosing the first digit = 8 ways
Number of ways of choosing the rest of the digits = 10^6
Therefore, 8 x 10^6 7-digit phone numbers are possible.


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Help please. I’m stuck on this one
Nastasia [14]

Answer:

b = 25m

Step-by-step explanation:

Hi there!

We're given angle B and the length of <em>a</em> in this right triangle. We must solve for the length of <em>b</em>. <em>a</em> and <em>b</em> are the two legs of the right triangle.

In this case, we can use the tangent ratio:

tan\theta=\displaystyle\frac{opposite}{adjacent}

Plug in the given information:

tan\displaystyle\frac{\pi}{4} =\displaystyle\frac{b}{25}\\\\25tan\displaystyle\frac{\pi}{4} =b\\\\b=25

Therefore, b = 25m.

We can also use this using special triangle rules. \displaystyle\frac{\pi}{4} radians is equal to 45 degrees, making this a 45-90-45 triangle. This would make <em>a</em> and <em>b</em> equal in length.

I hope this helps!

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harina [27]
White roses - 5 30 40 50
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Answer:

A

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The equation will be in the form

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with (x₁, y₁ ) = (0, 5) and (x₂, y₂ ) = (2.5, 0) ← 2 points on the line

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The line crosses the y- axis at (0, 5) ⇒ c = 5

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GrogVix [38]
The answer is B - vertical angles
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