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3 years ago

Help me I dont understand ittt

Mathematics

1 answer:

stepan [7]3 years ago

8 0

It’s a. vertex is the lowest or highest point so (1,-8) x-intercepts is where the parabola hits the x axis so (-1,0) and (3,0)

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What is 2+2a when a=3b and b=1/a^c

Aleksandr-060686 [28]

Answer:

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Step-by-step explanation:

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3 years ago

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notsponge [240]

Line a and b are perpendicular

3 0

3 years ago

t is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken if the desir

PtichkaEL [24]

Answer:

The sample size needed to be taken is approximately 74.

Step-by-step explanation:

To get alpha; we have 1 - 0.95 = 0.05

Therefore, $z_{\frac{a}{2} } = \frac{0.05}{2} = 0.025$

The we look up z* in a Standard Normal table where α = 0.025 area in each tail.

From the table, z* = 1.96

From the question variance is 484, then the standard deviation is 22

Standard deviation = $\sqrt{Var(x)} = \sqrt{484} = 22$

And margin of error is 5 or less

The formula for margin of error is given as:

margin of error = $\frac{(z^{*}) (SD)}{\sqrt{n} }$

$5 = \frac{1.96 * 22}{\sqrt{n} } \\5 = \frac{43.12}{\sqrt{n} } \\5 * \sqrt{n} = 43.12\\(5)^{2} * (\sqrt{n} )^{2} = (43.12)^2\\25 * n = 1859.3344\\25n = 1859.3344\\\frac{25n}{25} = \frac{1859.3344}{25} \\n = 74.373376\\n = 74$

The approximate value of n is 74.

3 0

3 years ago

F(x)=x^3+6x^2+x^1/2 and g(x)+x^1/2 . find f(x) divided by g(x)

dolphi86 [110]

To solve this problem you must apply the proccedure shown below:

1. You have that $f(x)=x^{3}+6x^{2}+x^{\frac{1}{2}}$ and $g(x)=x^{\frac{1}{2}}$ , therefore, you must divide must fucntion, as following:

$\frac{f(x)}{g(x)}=\frac{x^{2}+6x^{2}+x^{\frac{1}{2}}}{x^{\frac{1}{2}}}$

2. You must simplify it,by factoring out $x^{\frac{1}{2}}$ , as following:

$\frac{f(x)}{g(x)}=\frac{x^{\frac{1}{2}}( x^{\frac{5}{2}}+6x^{\frac{3}{2}}+1)}{x^{\frac{1}{2}}}$

3. Finally, you obtain that the answer is:

$\frac{f(x)}{g(x)}= x^{ \frac{5}{2} } +6 x^{ \frac{3}{2} } +1$

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3 years ago

Can someone help my cousin with this problem

Anika [276]

71 hours is the correct answer the first week is 7x8 which is 56 then 5x3 which is 15 and 56 to 15 and get your final answer of 71 hours.

4 0

3 years ago

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