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3 years ago

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which equation represents this sentence? one-half the sum of a number and four is three less than the quotient of five and the n

umber. 1/2n 4=5/n−3 1/2(n 4)=3−5/n 1/2(n 4)=5/n−3 1/2n 4=3−5/n

1 answer:

MariettaO [177]3 years ago

6 0

Let the number be n,
1/2 (n + 4) = 5/n - 3

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Multiply 3 2/5 • 2 1/3<br> Answer: <br> 5 2/15<br> 6 2/15<br> 7 2/15<br> 8 2/15

LenKa [72]

Answer:

7 2/15 is the answer to your question

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2 years ago

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A frame of width a surrounds a 5 by 7 inch photograph. Find the expression that represents the area of the frame in terms of a.

Arada [10]

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totalarea=totallengtht times totalwidth=(2a+5) times (2a+7)=4a²+24a+35

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which is 5 by 7 which is 35

4a²+24a+35-35=4a²+24a

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3 years ago

5 - -10 also I need a example thank u everyone for your help

Step2247 [10]

15

Step-by-step explanation:

A negative number being subtracted makes it positive

5 - -10

5+10 =15

6 0

3 years ago

Silicon wafers are scored and then broken into the many small microchips that will he mounted into circuits. Two breaking method

antoniya [11.8K]

Answer:

a

The estimate is $- 0.0265\le K \le 0.0465$

b

Method B this is because the faulty breaks are less

Step-by-step explanation:

The number of microchips broken in method A is $n_1 = 400$

The number of faulty breaks of method A is $X_1 = 32$

The number of microchips broken in method B is $n_2 = 400$

The number of faulty breaks of method A is $X_2 = 32$

The proportion of the faulty breaks to the total breaks in method A is

$p_1 = \frac{32}{400}$

$p_1 = 0.08$

The proportion of the faulty to the total breaks in method B is

$p_2 = \frac{28}{400}$

$p_2 = 0.07$

For this estimation the standard error is

$SE = \sqrt{ \frac{p_1 (1 - p_1)}{n_1} + \frac{p_2 (1- p_2 )}{n_2} } }$

substituting values

$SE = \sqrt{ \frac{0.08 (1 - 0.08)}{400} + \frac{0.07 (1- 0.07 )}{400} } }$

$SE = 0.0186$

The z-values of confidence coefficient of 0.95 from the z-table is

$z_{0.95} = 1.96$

The difference between proportions of improperly broken microchips for the two breaking methods is mathematically represented as

$K = [p_1 - p_2 ] \pm z_{0.95} * SE$

substituting values

$K = [0.08 - 0.07 ] \pm 1.96 *0.0186$

$K = - 0.0265 \ or \ K = 0.0465$

The interval of the difference between proportions of improperly broken microchips for the two breaking methods is

$- 0.0265\le K \le 0.0465$

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3 years ago

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krek1111 [17]

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Step-by-step explanation:

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3 years ago