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2 years ago

Please help I’ll give brainlyist

Mathematics

2 answers:

lakkis [162]2 years ago

6 0

Answer:

The second choice

Step-by-step explanation:

kati45 [8]2 years ago

3 0

Answer:

+ 6 $x^{2}$ and -10 $y^{2}$

Step-by-step explanation:

3 $x^{2}$ + 5 $y^{2}$ {} + 3 {} + 4 $y^{2}$ + 6 = 9 $x^{2}$ - $y^{2}$ + 9

3 $x^{2}$ + 9 $y^{2}$ {} + 9 {} = 9 $x^{2}$ - $y^{2}$ + 9

+ 6 $x^{2}$ -10 $y^{2}$

3 $x^{2}$ + 9 $y^{2}$ + 6 $x^{2}$ + 9 - 10 $y^{2}$ = 9 $x^{2}$ - $y^{2}$ + 9

9 $x^{2}$ - $y^{2}$ + 9 = 9 $x^{2}$ - $y^{2}$ + 9

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What is the answer of 7-4x=2-9x

julia-pushkina [17]

7-4x=2-9x the answer is x=1

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2 years ago

Read 2 more answers

Joey and Armando live on the same st as the park. The park is 9/10 mile from Joey's home. Joey leaves home and walks to Armando'

AleksandrR [38]

Let's start by assuming Armando's house is between Joey's and the park.

Let $x$ be the distance Joey walked to Armando's house.

<span>The park is 9/10 mile from Joey's home. Joey leaves home and walks to Armando's home. Then Joey and Armando walk 3/5 mile to the park.

</span> $\dfrac{9}{10} = x + \dfrac{3}{5}$

$x = \dfrac{9}{10} - \dfrac{3}{5} = \dfrac{9}{10} -\dfrac{6}{10} = \dfrac{3}{10}$

That's probably the answer they're looking for. But what if the park is between Joey and Armando's houses or Joey is between the park and Armando? (The latter isn't really possible with the given distances.)

Let $a, b, c$ be the distances between three collinear points like we have here. Our equation is really a few equations in one, something like

$\pm a \pm b = \pm c$

Let's get rid of the plus/minuses. Squaring,

$a^2 + b^2\pm 2ab = c^2$

$\pm 2ab = c^2-a^2-b^2$

$4a^2b^2 = (c^2-a^2-b^2)^2$

For us, that's a quadratic equation for $c^2$

$4(9/10)^2(3/5)^2= (c^2-(9/10)^2 - (3/5)^2)^2$

I'll skip right to the solutions,

$c^2=\dfrac{9}{100} \textrm{ or } c^2=\dfrac{9}{4}$

$c=\dfrac{3}{10} \textrm{ or } c=\dfrac{3}{2}$

We could have gotten the 3/2 just by adding 9/10+3/5 but this was more fun.

6 0

3 years ago

What is the probability a sample of 90 test takers will provide a sample mean test score within 10 points of the population mean

Elena-2011 [213]

Answer:

0.658 is the probability that a sample 90 test takers will provide a sample mean test score within 10 points of the population mean of 502.

Step-by-step explanation:

The following information is missing:

The standard deviation of population is 100.

We are given the following information in the question:

Population mean, μ = 502

Standard Deviation, σ = 100

Sample size, n = 90

Standard error =

$\dfrac{\sigma}{\sqrt{n}} = \dfrac{100}{\sqrt{90}} = 10.54$

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

P(test score within 10 points)

$P(492 \leq x \leq 512) \\\\= P(\displaystyle\frac{492 - 502}{10.54} \leq z \leq \displaystyle\frac{512-502}{10.54}) \\\\= P(-0.9487 \leq z \leq 0.9487)\\= P(z \leq 0.9487) - P(z < -0.9487)\\= 0.829 -0.171 = 0.658 = 65.8\%$

$P(492 \leq x \leq 512) = 65.8\%$

0.658 is the probability that a sample 90 test takers will provide a sample mean test score within 10 points of the population mean of 502.

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2 years ago

The company A produces products a, and the company B produces products b. It is known that 3 percent of companies that produce p

jeka94

Answer:

0.00183

Step-by-step explanation:

The two companies produce different products and the chance to go bankrupt will be different based on the product made. So, the probability of the company A and B to go bankrupt is independent.

To find the answer of this question, we just need to multiply the probability to go bankrupt of each company. The calculation will be:

P(A=bankrupt) * P(B=bankrupt)= 3% * 6.1% =0.183%= 0.00183

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3 years ago

You draw a marble from a bag that has 3 red, 4 blue, and 5 green, you also flip a fair coin. What is the probability you will dr

jeka94

Answer:

Step-by-step explanation:

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3 years ago