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3 years ago

PLEASE HELPPPPPPPPPPPPPPPPPPPP I WILL GIVE BRAINLIEST TO THE FIRST AND MOST CORRECT ANSWER. Also show your workkk pleaseeeeeee.

Mathematics

1 answer:

MariettaO [177]3 years ago

5 0

Answer:

21)21.2132034356

Step-by-step explanation:

$\sqrt{18\\}$ =4.2426406871

4.2426406871*5=21.2132034356

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What is the opposite of the opposite of a negative?

borishaifa [10]

Answer: A negative

Step-by-step explanation:

The opposite of a negative is positive, the opposite of a positive is a negative.

8 0

3 years ago

In a clinical trial of a cholesterol drug, 321 subjects were given a placebo, and 7% of them developed headaches. For such ra

artcher [175]

Answer: The value of n is 321.

Step-by-step explanation:

Since we have given that

Sample size = 321

Percentage of them developed headaches = 7%

So, the value of p would be

$\dfrac{x}{n}=\dfrac{7}{100}=0.07$

Now, the value of q would be

$q=1-p\\\\q=1-0.07\\\\q=0.93$

And the mean for the number of subjects who develop headaches would be

$n=pq\\\\n=0.07\times 0.93\\\\n=0.0651$

and the standard deviation would be

$\sigma=\sqrt{npq}\\\\\sigma=\sqrt{321\times 0.07\times 0.93}\\\\\sigma=4.571$

Hence, the value of n is 321.

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3 years ago

What is the slope of the blue line? what is the slope of the green line?

Ymorist [56]

Answer:

Blue Line’s Slope: -4/2

Green Line’s Slope: -4/2

Step-by-step explanation:

The slope of the line is the rise over run, or in this case the fall over run.

<h2><u>Hope This Helped!</u></h2>

4 0

3 years ago

Aaron bought a set of plastic ice cubes with a mixture of water and air inside.

adoni [48]

Answer:

The volume of water and air inside the plastic ice cube is 3000 mm³

Step-by-step explanation:

* Lets described the figure

- It consists of two identical rectangular pyramids stuck together

in their bases

- The dimensions of the base are 15 mm and 20 mm

- The height of ice cube is 30 mm

∴ The height of each pyramid = 30 ÷ 2 = 15 mm

* Lets talk about the volume of the rectangular pyramid

- The pyramid has a rectangular base and 4 triangular faces

- We have formulas to calculate the volume of the pyramid.

- To find the volume, we use the formula V = (1/3)AH, where

A = area of the pyramid's base and H = height of the pyramid

∵ The dimensions of the base are 20 mm and 15 mm

∴ A = 20 × 15 = 300 mm²

- The height of the pyramid is 15 mm

∵ H = 15 mm

∵ V = 1/3(AH)

∴ V = 1/3(300 × 15) = 1500 mm³

- The ice cube made from two identical rectangular pyramids

∴ The volume of the ice cube = 2 × 1500 = 3000 mm³

- The volume of the water and the air inside the ice cube equal

the volume of the ice cube

* The volume of water and air inside the plastic ice cube is 3000 mm³

3 0

3 years ago

The function g(x) = 3x2 − 12x + 7 written in vertex form is g(x) = 3(x − 2)2 − 5. What is the vertex of g(x)?

faltersainse [42]

Answer: The correct option is (C). (2, -5).

Step-by-step explanation: The given function is

$g(x)=3x^2-12x+7.$

The vertex form of the function g(x) is $g(x)=3(x-2)^2-5~~~~~~~~~~~~~~~~~~~~~~(i)$

We know that if the vertex form of a function f(x) is written as

$f(x)=a(x-h)^2+k,$

then its vertex is (h, k).

So, from equation (i), we can say that the vertex of function g(x) is

(2, -5).

Thus, (C) is the correct option.

5 0

3 years ago

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