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3 years ago

What is the standard-form equation of the ellipse shown?

Mathematics

1 answer:

lyudmila [28]3 years ago

3 0

Hello,

(x/6)²+(y/5)²=1
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-[3z+4]=6z-3[3z+2] solve this solution

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I think the answer is z€0

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What is -19 divided by 7

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You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

timama [110]

Answer:

the number of families needed for the survey is 2,157

Step-by-step explanation:

The computation of the number of families needed for the survey is shown below:

Given that

The Standard deviation is $900

Service level = 99%

z value at 99% = 2.58

Expenditures = $50

Based on the above information

The number of families needed for the survey is

$n = (\frac{zs}{E})^2\\\\= (\frac{2.58\times 900}{50})^2$

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3 years ago

Solve. -7x+1-10x^2=0

telo118 [61]

Answer:

$-7x+1-10x^2=0$

$-10x^2-7x+1=0$

$quadratic\:equation:-$ $ax^2+bx+c=0$

$solutions:-\\\\x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$For \\A=-10\\B=-7\\C=1$

$x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{\left(-7\right)^2-4\left(-10\right)\cdot \:1}}{2\left(-10\right)}$

$\sqrt{\left(-7\right)^2-4\left(-10\right)\cdot \:1}=\sqrt{89}$

$x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{89}}{2\left(-10\right)}$

$x_1=\frac{-\left(-7\right)+\sqrt{89}}{2\left(-10\right)},\:x_2=\frac{-\left(-7\right)-\sqrt{89}}{2\left(-10\right)}$

$\frac{-\left(-7\right)+\sqrt{89}}{2\left(-10\right)}=-\frac{7+\sqrt{89}}{20}$

$\frac{-\left(-7\right)-\sqrt{89}}{2\left(-10\right)}=\frac{\sqrt{89}-7}{20}$

$x=\frac{\sqrt{89}-7}{20}$

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