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2 years ago

4x – y if x = – 2 and y = 3 Evaluate

Mathematics

2 answers:

Radda [10]2 years ago

5 0

Answer:

-11

Step-by-step explanation:

4x -y

Substitute x and y

4( -2 ) - 3

Simplify

-8 -3

Subtract

-11

Kisachek [45]2 years ago

4 0

Answer:

-11

Step-by-step explanation:

$4x - y$

$4( - 2) - 3$

$- 8 - 3$

$- 11$

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Multiply these binomials using foil method (b+3)(b-9)

sleet_krkn [62]

FOIL stands for first, outer, inner, and last.
So, you multiply the first terms together, the outer terms together, the inner terms together, and then the last terms together.
(b+3)(b-9)
b^2-9b+3b-27 Then simplify
b^2-6b-27

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3 years ago

Is 7.0001 is terminating or repeating decimals

Viefleur [7K]

Answer:

it is terminating

Step-by-step explanation:

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2 years ago

The sum of the lengths of the two bases of a trapezoid is 22 cm and its area is 66 cm2.

ludmilkaskok [199]

Answer:

h = 6 cm

Step-by-step explanation:

Given that,

The area of a trapezoid, A = 66 cm²

The sum of the lengths of the two bases of a trapezoid is 22 cm.

We need to find the height of the trapezoid.

The area of a trapezium is given by :

$A=\dfrac{1}{2}\times (\text{sum of parallel sides})\times \text{height}$

Substitute the values,

$h=\dfrac{2A}{\text{sum of parallel sides}}\\\\h=\dfrac{2\times 66}{22}\\\\h=6\ cm$

So, the height of the trapezoid 6 cm.

8 0

2 years ago

What times what equals 3.75

Galina-37 [17]

Answer:

1\times 28=28\\2\times 14=28\\4\times 7=28

Step-by-step explanation: To obtain number 28, we will find the factors of this number.

Factors of this number are: 1, 2, 4, 7, 14, 28

From the given factors, we can find the combinations which will givs us the product as 28

We are asked to find the multiplication ( times) of two number that will yield a number 28. So, the combinations will be

1\times 28=28\\2\times 14=28\\4\times 7=28

Step-by-step explanation:

7 0

3 years ago

Netflix is considering a new romcom (romantic comedy) series. Before making a final decision, the producers design an experiment

Ne4ueva [31]

Using the z-distribution, as we are working with a proportion, it is found that:

a) The population proportion is of 0.625.

b) The interval is (0.586, 0.664).

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which:

$\pi$ is the sample proportion.

z is the critical value.

n is the sample size.

In this problem, we have a 99% confidence level, hence $\alpha = 0.99$ , z is the value of Z that has a p-value of $\frac{1+0.99}{2} = 0.995$ , so the critical value is z = 2.575.

The sample size and the population proportion are given, respectively, by:

$n = 1040, \pi = \frac{650}{1040} = 0.625$

Hence, the bounds of the interval are given by:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.625 - 2.575\sqrt{\frac{0.625(0.375)}{1040}} = 0.586$

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.625 + 2.575\sqrt{\frac{0.625(0.375)}{1040}} = 0.664$

More can be learned about the z-distribution at brainly.com/question/25890103

7 0

1 year ago