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3 years ago

Plz help me due today

Mathematics

1 answer:

GREYUIT [131]3 years ago

3 0

Answer:

the suare root of nine is rational (bc its 3) the other two are not

Step-by-step explanation:

can i get brainliest please???

it would be very much appreciated

have a nice day :)

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Subtract.

Katena32 [7]

(8x - 8y + 9) - (5x - 8y - z) = 3x + z + 9

8 - 5 = 3
-8 - (-8) = 0
9 - 0 =9
0 - (-z) = z

so it is written 3x +z +9

4 0

4 years ago

Read 2 more answers

An astronaut on the moon drops a tool from the door of the landing ship. The quadratic function f(x)=-2x^2+10 models the height

Gekata [30.6K]

Answer:

2.2 seconds.

Step-by-step explanation:

We have been given that an astronaut on the moon drops a tool from the door of the landing ship. The quadratic function $f(x)=-2x^2+10$ models the height of the tool, in meters, after x seconds.

To find the time, it will take for the tool to hit the surface of moon, we will set $f(x)=0$ and solve for x as:

$-2x^2+10=0$

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

$-2x^2=-10$

Divide both sides by negative 2:

$\frac{-2x^2}{-2}=\frac{-10}{-2}$

$x^2=5$

Now, we will take square root of both sides:

$\sqrt{x^2}=\pm\sqrt{5}$

$x=\pm 2.236067$

$x\approx 2.2$

Since time cannot be negative therefore, it will take 2.2 seconds for the tool to hit the surface of the moon.

8 0

4 years ago

What is the value of y?<br> 88<br><br> need help

Scorpion4ik [409]

Well you see it’s any other letter that’s not In the alphabet

7 0

3 years ago

Read 2 more answers

Bonnie is making a dipping sauce. She mixes 150 milliliters of soy sauce with 100 milliliters of vinegar. How much soy sauce doe

natali 33 [55]

First step

You must stablish a relation

150 ml sauce/100 ml vinegar

If 100 ml vinegar_______150ml sauce then 11 ml vinegar ____x ml sauce

Second step

You must resolve x from the equation

X= (11ml vinegar*150 ml soya)/(100 ml vinegar)= 16.5 ml sauce, it means that it will be 16,5 ml sauce by every 11 ml of vinegar

5 0

4 years ago

Read 2 more answers

A research company desires to know the mean consumption of meat per week among people over age 23. A sample of 164 people over a

Elan Coil [88]

Answer:

The 80% confidence interval for the mean consumption of meat among people over age 23 is between 4 and 4.2 pounds.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.8}{2} = 0.1$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.1 = 0.9$ , so $z = 1.28$

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.28*\frac{0.7}{\sqrt{164}} = 0.07$

The lower end of the interval is the mean subtracted by M. So it is 4.1 - 0.07 = 4.03 pounds

The upper end of the interval is the mean added to M. So it is 4.1 + 0.07 = 4.17 pounds

Rounded to one decimal place

The 80% confidence interval for the mean consumption of meat among people over age 23 is between 4 and 4.2 pounds.

8 0

3 years ago