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Art [367]
2 years ago
15

Please help me with this math :)

Mathematics
2 answers:
hram777 [196]2 years ago
7 0

Answer: x=1.75

Step-by-step explanation:

rearrange the term: 3.5 (2.25 + <em>x</em>) = 14

the new term: 3.5 (<em>x</em> + 2.25) = 14

Combine multiplied terms into a single fraction, then distribute.  

<em>x</em> = 1.75

Cerrena [4.2K]2 years ago
4 0

Answer:

The X is equal to 1.75

Step-by-step explanation:

3.5X2.25=7.875

14/7.875=1.75

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Perimeter of the whole shabang should be (7*2)+(5*2)

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3 years ago
a manufacturer of bicycle parts requires that a bicycle chain have a width of 0.3 inch with an absolute deviation of at most 0.0
quester [9]

Answer:

|w-0.3| \leq 0.0003

And solving we got:

-0.0003 \leq w-0.3 \leq 0.0003

0.3-0.0003 \leq w \leq 0.3+0.0003

0.2997 \leq w \leq 0.3003

Step-by-step explanation:

For this case we can define the following notation:

W represent the width

And we want a maximum error of 0.0003 so we can set up the following equation:

|w-0.3| \leq 0.0003

And solving we got:

-0.0003 \leq w-0.3 \leq 0.0003

0.3-0.0003 \leq w \leq 0.3+0.0003

0.2997 \leq w \leq 0.3003

3 0
2 years ago
In a recent poll, 35% of survey respondents said that, if they only had one child, they would prefer the child to be a boy. Supp
Schach [20]

Answer:

we have that z = 1.8326 which is not close to z factor of 0. The result is not within limits.

Step-by-step explanation:

Following normal approximation to binomial we have

mean = n×p

standard deviation = √(n×p×(1-p))

n is equal to 160

p is equal to 35%

n×p is equal to 150×0.35 = 52.5

this is the probability that you would expect based on the knowledge that 35% of survey respondents said they would prefer a boy than a girl.

in your survey you got 74 out of 150 and you want to know if this is statistically significant or if you can expect this deviation by chance.

standard deviation is calculated as √(n×p× (1-p))which becomes

√ (150×0.35×0.75 = 6.2749 which is more than enough accuracy for what is required.

without a continuity correction, your formula would be:

z (74 > 52.5) = (population mean - sample mean) / population standard deviation which becomes (74-52.5)/6.2749 = 1.8326

this is not close to a z factor of 0 which means that the results are not within limits.

with a continuity correction, your formula would be:

z (52.5 > 52.5) = 0

A z factor of zero means that your sample mean is exactly the population mean.

3 0
3 years ago
Which ordered pairs make the equation true? 3x + 2y = –7
Anestetic [448]
(3,-8),(-3,1) and (-2,-1) make the equation true.
7 0
2 years ago
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