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4 years ago

Please i will give brainly

Mathematics

2 answers:

d1i1m1o1n [39]4 years ago

8 0

A:x+3=11
B:X(to the power of 3) + 9
C:x-7=7
D:x(to the power of 3) = 3

serg [7]4 years ago

3 0

Equation for a
3x+11

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Kim was walking down a rocky path. For 4 minutes, the elevation dropped at the same rate. Altogether it dropped 8 feet. What was

Marianna [84]

Answer:

-2 ft/min

Step-by-step explanation:

If Kim dropped for a total of 8 feet over the course of 4 minutes, then 8 feet/4 min equals 2 ft/min, but because they are dropping it should be negative.

7 0

3 years ago

4,-4 on the coordinate plane<br><br><br>would 4 go on the x-axis or y-axis bc im du mb :)

ANTONII [103]

4 would go on the x axis because it always starts like this (x, y)

5 0

3 years ago

Find the x-coordinates of any relative extrema and inflection point(s) for the function f(x)= 6x^1/3 + 3x^4/3. You must justify

irina [24]

Answer:

x-coordinates of relative extrema = $\frac{-1}{2}$

x-coordinates of the inflexion points are 0, 1

Step-by-step explanation:

$f(x)=6x^{\frac{1}{3}}+3x^{\frac{4}{3}}$

Differentiate with respect to x

$f'(x)=6\left ( \frac{1}{3} \right )x^{\frac{-2}{3}}+3\left ( \frac{4}{3} \right )x^{\frac{1}{3}}=\frac{2}{x^{\frac{2}{3}}}+4x^{\frac{1}{3}}$

$f'(x)=0\Rightarrow \frac{2}{x^{\frac{2}{3}}}+4x^{\frac{1}{3}}=0\Rightarrow x=\frac{-1}{2}$

Differentiate f'(x) with respect to x

$f''(x)=2\left ( \frac{-2}{3} \right )x^{\frac{-5}{3}}+\frac{4}{3}x^{\frac{-2}{3}}=\frac{-4x^{\frac{2}{3}}+4x^{\frac{5}{3}}}{3x^{\frac{2}{3}}x^{\frac{5}{3}}}\\f''(x)=0\Rightarrow \frac{-4x^{\frac{2}{3}}+4x^{\frac{5}{3}}}{3x^{\frac{2}{3}}x^{\frac{5}{3}}}=0\Rightarrow x=1$

At x = $\frac{-1}{2}$ ,

$f''\left ( \frac{-1}{2} \right )=\frac{4\left ( -1+4\left ( \frac{-1}{2} \right ) \right )}{3\left ( \frac{-1}{2} \right )^{\frac{5}{3}}}>0$

We know that if $f''(a)>0$ then x = a is a point of minima.

So, $x=\frac{-1}{2}$ is a point of minima.

For inflexion points:

Inflexion points are the points at which f''(x) = 0 or f''(x) is not defined.

So, x-coordinates of the inflexion points are 0, 1

7 0

3 years ago

Papa John's sold 50 pizzas on Monday. Of the pizzas sold, 35 of them were delivered. What percent were delivered?

Charra [1.4K]

Answer:

75%

Step-by-step explanation:

if i'm wrong i'm really sorry-

7 0

3 years ago

Read 2 more answers

In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a mean of 25 minutes and a standa

qaws [65]

Answer:

$z=0.674$

And if we solve for a we got

$a=25 +0.674*4=27.7$

So the value of height that separates the bottom 75% of data from the top 25% is 27.7 minutes.

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the time to complete a simple haircut of a population, and for this case we know the distribution for X is given by:

$X \sim N(25,4)$

Where $\mu=25$ and $\sigma=4$

We are interested in the slowest quartile or the first quartile

For this part we want to find a value a, such that we satisfy this condition:

$P(X>a)=0.25$ (a)

$P(X$ (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.

As we can see on the figure attached the z value that satisfy the condition with 0.75 of the area on the left and 0.25 of the area on the right it's z=0.674. On this case P(Z<0.674)=0.75 and P(z>0.674)=0.25

If we use condition (b) from previous we have this:

$P(X$

$P(z$

But we know which value of z satisfy the previous equation so then we can do this:

$z=0.674$

And if we solve for a we got

$a=25 +0.674*4=27.7$

So the value of height that separates the bottom 75% of data from the top 25% is 27.7 minutes.

7 0

4 years ago