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3 years ago

A symbol, usually a letter, that represents an unknown quantity is called a ________________.

Mathematics

2 answers:

andrey2020 [161]3 years ago

6 0

Answer:

A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.

Step-by-step explanation:

GREYUIT [131]3 years ago

4 0

Answer:

a symbol, usually a letter, that represents an unknown quantity is called x.

Step-by-step explanation:

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Hello! Question.

Bumek [7]

If I’m analyzing the question correct, you would pay 912 in total

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3 years ago

Six different second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic re

mixer [17]

Answer: range= 26, variance= 80 and standard deviation= 8.94

Step-by-step explanation:

Range = highest - lowest

Range = 146 - 120

Range= 26

Let m be mean

M=mean=sum/n

Mean=(120+134+146+127+138+133) / 6

M=798/6

M=133

The standard deviation sample formula:

S.D = sqrt( Summation of |x-m|^2 / n-1)

Let start finding:

|x-m|^2

For 1st: |120-133|^2=169

For 2nd: |134-133|^2=1

For 3rd: |146-133|^2=169

For 4th: |127-133|^2=36

For 5th: |138-133|^2=25

For 6th: |133-133|^2=0

Summation of |x-m|^2 = 400

The standard deviation formula is :

S.D = sqrt( Summation of |x-m|^2 / n-1)

S.D= sqrt(400 / 5)

S.D=sqrt(80)

S.D= 8.94

Variance = (Summation of |x-m|^2 / n-1)

Variance= 400/5

Variance= 80

3 0

4 years ago

Read 2 more answers

What are the coordinates of the x-intercepts of the parabola y = x² - 8x + 15?

tamaranim1 [39]

Answer:

(3, 0) and (5, 0)

Step-by-step explanation:

we have

$y=x^{2}-8x+15$

we know that

The x-intercepts are the values of x when the value of y is equal to zero

For y=0

$x^{2}-8x+15=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}-8x+15=0$

$a=1\\b=-8\\c=15$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(1)(15)}} {2(1)}$

$x=\frac{8\pm\sqrt{4}} {2}$

$x=\frac{8\pm2} {2}$

$x=\frac{8+2} {2}=5$

$x=\frac{8-2} {2}=3$

x=3, x=5

therefore

The x-intercepts are (3,0) and (5,0)

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3 years ago

Find the volume . V = l * w * h.

Oxana [17]

Answer: you did not explain it well if you did i would know it but i think i=7 w=18 h=25

Step-by-step explanation:

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3 years ago

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The proper sequence to use in solving 3x - 2 = 60 is:

IrinaVladis [17]

If you follow the steps of PEMDAS it should be Multiply by 3,subtract 2.

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3 years ago