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EleoNora [17]
2 years ago
7

How many permutations of a 7-digit phone number exist if any number 0-9 may be used but repetition is not allowed?

Mathematics
1 answer:
Blizzard [7]2 years ago
5 0

Answer:

10!/3!

Step-by-step explanation:

You might be interested in
Which of the following is the point-slope form of the line?
ryzh [129]

Answer:

A

Step-by-step explanation:

We can see that the slope is positive, which means that the x-term must be positive.

If you expand and simply both equations into the form y = mx + b, you will find that m is positive for A and negative for B, hence A is the correct answer.

4 0
3 years ago
4
const2013 [10]

Answer:

the third

Step-by-step explanation:

your photo is not clear, and your explanations for your question is not clear also.

as we are tackling the substraction and the addition questions between matricxs.We could simply +/- every number correspondingly.

4 0
3 years ago
I SHALL REWARD THEE WITH BRAINLIEST Change -2Y - 2X = -6 to the slope intercept form of the equation of a line (I NEED EXPLANATI
DaniilM [7]

Answer:

y = -x + 3    

Step-by-step explanation:

First of all, you need to memorize several forms of the equation of a straight line.  Here you have -2y - 2x = -6 in "standard form" and want the equivalent equation in "slope intercept form," y = mx + b.

To get this, solve the first equation for y by dividing all three terms by -2:

y + x = 3.

Then solve this result for y:

y = -x + 3    

This is the desired equation in slope-intercept form.

8 0
3 years ago
Please help me on #37. I know for A you would use the quadratic equation but I got the wrong answer.
ozzi
Δ = (8i)^2 - 4*(-25) => Δ = -36 +100 => Δ = 64 => x1 =(-8i + 8)/2 => x1 = -4i +4;
x2 = (-8i - 8)/2 => x2 = -4i-4; in this case, your solutions are complex conjugates.
6 0
3 years ago
On a bicycle, Eddie can travel 20 miles in 4 hours. How many hours does it take Eddie to travel 1 mile?
Paul [167]

Answer:

1 mile = 0.2 hours

Step-by-step explanation:

Given that,

Eddie can travel 20 miles in 4 hours.

We need to find how many hours does it take Eddie to travel 1 mile.

20 mile = 4 hours

1 mile = (4/20) hours

= 0.2 hours

So, to travel 1 mile will take 0.2 hours.

3 0
3 years ago
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