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3 years ago

Which system of equations has exactly one solution?

Mathematics

1 answer:

tester [92]3 years ago

8 0

Answer: Most of them cross each other once so I am not sure which one is the answer (sorry)

Step-by-step explanation:

x+y=7 is parallel to 3x+3y=3 and -6x-6y=3

3x+y=-1 and 6x+2y=-2 have infinite solutions togther (both are on top of each other)

The rest of the ways cross each other once

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A shipment of 20 DVDs has arrived at a video rental store. Based on past experience, the manager knows that 10% of all new DVDs

aleksley [76]

Answer:

The probability is 0.081

Step-by-step explanation:

Here, we want to calculate the probability that the 3rd inspection will be defective.

What this means is that the first two would

not be defective.

Probability of having a defective DVD = 10% = 10/100 = 0.1

Probability of not having a defective DVD = 1 -0.1 = 0.9

So the probability of third being defective = Probability of first not defective * Probability of second not defective * Probability of third defective

= 0.9 * 0.9 * 0.1 = 0.081

7 0

3 years ago

Para pertenecer al equipo de futbol femenino de una ciudad se deben presentar 18 pruebas y por cada prueba hecha de forma correc

GenaCL600 [577]

Answer:

150 scores

Step-by-step explanation:

The computation of the score did she get is shown below:

Since there is 18 test presented

And if the test is done on correct manner so 10 points should be awarded

Now since fifth-sixth would be done correctly

So,

= 18 × 5 ÷ 6 × 10

= 150 scores

7 0

3 years ago

The sum of two numbers is 854. One of the numbers is 447. What is the other number?

charle [14.2K]

Answer:

the answer to the other number is 407

Step-by-step explanation:

7 0

4 years ago

Read 2 more answers

What's the law of indices

Nastasia [14]

Answer:

Indices are used to show numbers that have been multiplied by themselves. They can also be used to represent roots, such as the square root, and some fractions. The laws of indices enable expressions involving powers to be manipulated more efficiently than writing them out in full.

8 0

3 years ago

Read 2 more answers

Select all of the values of x that make the inequality -x+6= or grater than 10 true.

il63 [147K]

Answer:

2/5

3/2

Step-by-step explanation:

Note that:

> = Greater than

< = Less than

≤ = Less than or equal to

≥ = Greater than or equal to

Solution:

Since it given that 27/7n > 4/3

It means that

27/7n is greater than 4/3.

Now going through all answer choices:

----------------------------------------------------------------------------------------------------------

27/7(2/5) = 1 19/35

1 19/35 is greater than 4/3

Thus, 2/5 is true.

----------------------------------------------------------------------------------------------------------

27/7(1/3) = 1 2/7

1 2/7 isn't greater than 4/3

Thus, 1/3 is false.

----------------------------------------------------------------------------------------------------------

27/7(1) = 3 6/7

3 6/7 is greater than 4/3

Thus, 1 is true.

----------------------------------------------------------------------------------------------------------

27/7(2/9) = 6/7

6/7 isn't greater than 4/3

Thus, 2/9 is false.

----------------------------------------------------------------------------------------------------------

27/7(3/2)=5 11/14

5 11/14 is greater than 4/3

Thus, 3/2 is true.

----------------------------------------------------------------------------------------------------------

[Matthew1756654]

5 0

2 years ago