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3 years ago

What values of x will make x^2 =49 ( please I need help)

Mathematics

2 answers:

sergey [27]3 years ago

3 0

Answer:

7 and -7

.........

adelina 88 [10]3 years ago

3 0

7 or -7 is the answer

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Cilantro tastes like soap to some people. This soap taste is inherited through the olfactory receptor gene OR6A2. About 14% of t

timama [110]

Answer:

You must test a sample size of at least 514 Americans.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence interval $1-\alpha$ , we have the following confidence interval of proportions.

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

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$ is the margin of error.

95% confidence interval

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $z = 1.96$ .

We have that:

$M = 0.03, \pi = 0.14$

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

$0.03 = 1.96\sqrt{\frac{0.14*0.86}{n}}$

$0.03\sqrt{n} = 0.68$

$\sqrt{n} = 22.67$

$n = 513.92$

You must test a sample size of at least 514 Americans.

4 0

3 years ago

Read 2 more answers

Pls help Annabelle and navene are multipleing something Idk

Lelu [443]

Answer:

Annabelle is correct.

Step-by-step explanation:

1. When multiplying two numbers with exponents, the exponents are always added and not multiplied. However, when there is an number with an exponent that has an exponent (for example (5^2)^3) you would multiply them.

2. Applying this to your question would make Annabelle's work correct and Navene's work incorrect.

Hope you understood!

5 0

3 years ago

Read 2 more answers

If x^2+1/x^2=3 find the value of x^2/(x^2+1)^2<br> Express answer as a common fraction.<br> Thanks!!

timama [110]

$x^2+\dfrac1{x^2}=3\implies x^4+1=3x^2\implies x^4-3x^2+1=0$

By the quadratic formula,

$x^2=\dfrac{3\pm\sqrt5}2\implies x^2+1=\dfrac{5\pm\sqrt5}2$

Then

$(x^2+1)^2=\dfrac{25\pm10\sqrt5+5}4=\dfrac{15\pm5\sqrt5}2$

$\implies\dfrac{x^2}{(x^2+1)^2}=\dfrac{\frac{3\pm\sqrt5}2}{\frac{15\pm5\sqrt5}2}=\dfrac{3\pm\sqrt5}{15\pm5\sqrt5}$

Multiply numerator and denominator by the denominator's conjugate:

$\dfrac{3\pm\sqrt5}{15\pm5\sqrt5}\cdot\dfrac{15\mp5\sqrt5}{15\mp5\sqrt5}=\dfrac{45\pm15\sqrt5\mp15\sqrt5-25}{15^2-(5\sqrt5)^2}=\dfrac{20}{100}=\dfrac15$

3 0

3 years ago

I neeeeeeed Help please!

pochemuha

Answer:

i ask your teacher

Step-by-step explanation:

ask your teacher instead of asking for answers

4 0

4 years ago

Find the domain.<br> f(x)=x^2-81/x^2-2x-8

r-ruslan [8.4K]

The answer is

-2,4
basically all of the valid x values

3 0

3 years ago