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3 years ago

Let x be normally distributed with mean μ = 133 and standard deviation σ = 23. use table 1.

Mathematics

1 answer:

Svetlanka [38]3 years ago

8 0

A) z value = (x - π) / <span>σ = 100 - 133 / 23 = -1.43
p(<= 100) = 0.0764

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Then nth term of a sequence is 10-4n list the first 3 terms

BabaBlast [244]

6, 2, -2 i could be wrong :/

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3 years ago

Today everything at the store is on sale. The store is offering a 20% discount on all items.

katovenus [111]

Answer:

Number 1: $14.40

Number 2: $21.60

Step-by-step explanation:

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2 years ago

Are the equations lxl – 3 = 7 and [x] = 10 equivalent?

zvonat [6]

They're not equivalent.

$|x|$ (vertical bars) represents the absolute value of x. How it works is that it turns negative numbers positive but leaves 0 and positive numbers alone (hence it gets a number's distance from 0 on the number line).

$[x]$ (square brackets) usually represents the floor function, which returns the largest integer that is less than or equal to x. (The floor of x can also be written as $\lfloor x \rfloor$ --- it depends on what your textbook/source says).

To solve $|x| - 3 = 7$ , you first transform it into the equivalent equation $|x| = 10$ . Then by definition of absolute value, there are only two solutions for the first equation: x = 10 or x = -10.

[x] = 10 has infinitely many solutions. For example, the floor of 10 is 10, so $[10] = 10$ , thus a solution for the second equation is x = 10

The floor of 10.1 is 10, so $[10.1] = 10$ , thus another solution for the second equation is x = 10.1.

The two equations do not have the same solution set (as x = 10.1 does not solve |x| - 3 = 7 but solves [x] = 10), so they're not equivalent.

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2 years ago

How to take a line in desmos and reflect it over y axis and find equation.

Pachacha [2.7K]

Answer:

Reflecting a function over any axis can be complicated if you do not know the proper way to do it, so I am going to use examples to show you.

If f(x)=x is your normal function, then flipping it across the y-axis would look like f(x)=-x.

Step-by-step explanation:

Placing a - sign before the X will make it flip across the y-axis. After the X, and it flips across the X-axis.

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2 years ago

NEED TO KNOW ASAP<br> Which of the following is a quadratic inequality?<br> Oy<2x+7<br> Oy Oy

Burka [1]

Answer:

Step-by-step explanation:

A quadratic inequality is one that involves a quadratic polynomial.

<h3>Identification</h3>

The degree of a polynomial is the value of the largest exponent of the variable. When the degree of a polynomial is 2, we call it a <em>quadratic</em>.

For the following inequalities, the degree of the polynomial in x is shown:

y < 2x +7 . . . degree 1
y < x^3 +x^2 . . . degree 3
y < x^2 -5x . . . degree 2 (quadratic)

<h3>Application</h3>

We see that the degree of the polynomial in x is 2 in ...

y < x^2 -5x

so that is the quadratic inequality you're looking for.

<em>Additional comment</em>

When a term involves only one variable, its degree is the exponent of that variable: 5x^3 has degree 3. When a term involves more than one variable, the degree of the term is the sum of the exponents of the variables: 8x^4y3 has degree 4+3=7.

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2 years ago