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1 year ago

11. FOUR 4's. Using only four 4's, the operations (+,-, x, +), and parentheses,

Mathematics

1 answer:

Marysya12 [62]1 year ago

7 0

Answer:

see below

Step-by-step explanation:

You want an arithmetic expression using four 4s that evaluates to each of the digits 0-9.

<h3>Expressions</h3>

0 = 4 +4 -4 -4

1 = 4/4 +4 -4

2 = 4 -(4 +4)/4

3 = (4 +4 +4)/4

4 = 4 + (4 -4)*4

5 = (4*4 +4)/4

6 = 4 +(4 +4)/4

7 = 4 +4 -4/4

8 = 4 +4 +4 -4

9 = 4 +4 +4/4

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A data set includes 40 pulse rates of men, and those pulse rates have a mean of 67.3 beats per minute and a standard deviation o

Dafna11 [192]

Answer:

The 99% confidence interval of the standard deviation of the pulse rates of men is

$[ 7.949 \ \ , \ 14.387 ]$

Step-by-step explanation:

From the question we are told that

The sample size is n = 40

The mean is $\= x = 67.3 \ beats \ per \ minute$

The standard deviation is $s = 10.3 \ beats \ per \ minute$

Generally the degree of freedom is mathematically represented as

$df = n- 1$

=> $df = 40- 1$

=> $df = 39$

From the question we are told the confidence level is 99% , hence the level of significance is

$\alpha = (100 - 99 ) \%$

=> $\alpha = 0.01$

Generally from the chi distribution table the critical value of at a degree of freedom of is

$X^2 _{\frac{\alpha }{2} , 39} = 65.476$

Generally from the chi distribution table the critical value of at a degree of freedom of is

$X^2 _{1- \frac{\alpha }{2} , 39} = 19.996$

Generally the 99% confidence interval of the standard deviation of the pulse rates of men is mathematically represented as

$s \sqrt{\frac{n- 1}{X^2_{1- \frac{\alpha }{2} , n-1} } }\ \ , \ s \sqrt{\frac{n- 1}{X^2_{\frac{\alpha }{2} , n-1} } }$

=> $10.3 \sqrt{\frac{40- 1}{65.476} }\ \ , \ 10.3 \sqrt{\frac{40- 1}{19.996} }$

=> $[ 7.949 \ \ , \ 14.387 ]$

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2 years ago

What is 5.4 + (-3.6)

masya89 [10]

Answer:

1.8

Step-by-step explanation:

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2 years ago

Linear system word problem PLEASE SOLVE

tigry1 [53]

Write the equation
popcorn, x
drinks, y
51.25 = 5x + 5y
122.25 = 15x + 8y

Multiply the 1st row by 3
15x+15y=153.75
15x+8y=122.251
Subtract the 2nd row from the 1st row
7y=31.5
Divide both sides by 7
y=31.5/7
simplify
y = 4.5

Substitute y=4.5 into any of the two equations above
Let's pick the first equation
15x+15y=153.75
15x+15(4.5)=153.75
Simplify
15x+67.5=153.75
Subtract 67.5 from both sides
15x=153.75−67.5
Simplify
15x=86.25
Divide both sides by 15
x=86.25/15
Simplify
x=5.75

Therefore,
x=5.75
y=4.5

Follow along on a piece of paper, it'll help you get it.

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3 years ago

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Elanso [62]

i think it's the first option since the others make no sense

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1 year ago

a ball is thrown vertically upward from the top of a 100 foot tower, with an initial velocity of 20ft/sec. Its position function

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we are given

position function as

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