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Amiraneli [1.4K]
2 years ago
14

A lock has two digit numeric code, with the numbers 1 through 7 available for each digit of the code. Note that numbers can be r

epeated in the code so there are 7 possibilities for each two digits. Find the total number of possible codes for the lock.
Mathematics
1 answer:
lubasha [3.4K]2 years ago
7 0
If there is 2 digits and 7 numbers the combos would be:
1,1 2,1 3,1 4,1 5,1 6,1 7,1
1,2 2,2 3,2 4,2 5,2 6,2 7,2
1,3 2,3 3,3 4,3 5,3 6,3 7,3
1,4 2,4 3,4 4,4 5,4 6,4 7,4
1,5 2,5 3,5 4,5 5,5 6,5 7,5
1,6 2,6 3,6 4,6 5,6 6,6 7,6
1,7 2,7 3,7 4,7 5,7 6,7 7,7

Therefore there are 49 possible combinations :)
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What’s the distance formula
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Step-by-step explanation:

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3 years ago
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Use the quadratic formula to solve the equation.–x2 + 5x = 3
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Given the equation - x² + 5x = 3, which can be rewritten as:

- x² + 5x - 3 = 0

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Quadratic formula:

\frac{-b\text{ }\pm\text{ }\sqrt[]{b^2\text{ - 4ac}}}{2a}

Now, we just replace the values of a, b and c on the equation above.

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=

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1 year ago
PLEASE ANSWER THIS: look at the pic for question. Thanks!!!
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Answer:

\text{D. }b^2-4ac>0

Step-by-step explanation:

The equation b^2-4ac represents the discriminant of a quadratic. It is the part taken from under the radical in the quadratic formula.

For any quadratic:

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  • If the discriminant is equal to 0, the quadratic has one distinct real solution (the solution is repeated).
  • If the discriminant is negative, or less than 0, the quadratic has zero solutions

In the graph, we see that the equation intersects the x-axis at two distinct points. Therefore, the quadratic has two solutions and the discriminant must be positive. Thus, we have b^2-4ac>0.

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3 years ago
Jacob copies 30% of a document. He copies 8 pages. Write the number of pages in the<br>document.​
lana66690 [7]

Answer:

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<h2><u>Number of documents</u></h2>

jacob copies 30% of a document which is 8 pages

we can solve this using cross multiplication

30 %       :        8

100%      :         x

30%x = 100%*8

30% x = 8

x = 8/ 30%

x = 26.667

to 2sf

<h3><u>number of pages in the documents 27 </u></h3>

<u />

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288/32=144/16=72/8=9

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