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3 years ago

0.3x+5.14=2.1x – 4.4

Mathematics

2 answers:

Alexxandr [17]3 years ago

8 0

Answer:

x = 5.3

Step-by-step explanation:

ehhh, i'm jus helping,

you're welcome :)

Westkost [7]3 years ago

5 0

Answer:

To find:

Step-by-step explanation:

0.3x+5.14=2.1x – 4.4

0.3x-2.1x=-4.4-5.14

-1.8x=-9.54

x=-9.54/-1.8

To remove the decimal point, multiply with 100 on both numerator and denominator as their are two digits after the decimal point

x=-9.54 × 100/-1.8 × 100

therefore you will get,

x=-954/-180

cut the negative sign from both numerator and denominator

x=954/180

x=53

hope it helps you!!

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Need help tremendously:)!!

Ray Of Light [21]

For 12, do 26xpi. For 13, do 4x9.

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4 years ago

To calculate 4 1/5% tax on $63.78, multiply 4.2 times 63.78. True or False.

Marina86 [1]

$\bf {{ a}}\%\ of\ b \implies \cfrac{{{ a}}}{100}\cdot b\implies {{ a}}\div 100\cdot b\qquad thus\\\\
-----------------------------\\\\
{{ 4\frac{1}{5}}}\%\ of\ 63.78 \implies \cfrac{{{ 4\frac{1}{5}}}}{100}\cdot 63.78\implies {{ 4\frac{1}{5}}}\div 100\cdot 63.78$

you tell us, what would you end up multiplying 63.78 there, to get the 4 1/5% of it?

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4 years ago

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The time for a professor to grade a student's homework in statistics is normally distributed with a mean of 12.6 minutes and a s

Rus_ich [418]

Answer:

37.23% probability that randomly selected homework will require between 8 and 12 minutes to grade

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 12.6, \sigma = 2.5$

What is the probability that randomly selected homework will require between 8 and 12 minutes to grade?

This is the pvalue of Z when X = 12 subtracted by the pvalue of Z when X = 8. So

X = 12

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{12 - 12.6}{2.5}$

$Z = -0.24$

$Z = -0.24$ has a pvalue of 0.4052

X = 8

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{8 - 12.6}{2.5}$

$Z = -1.84$

$Z = -1.84$ has a pvalue of 0.0329

0.4052 - 0.0329 = 0.3723

37.23% probability that randomly selected homework will require between 8 and 12 minutes to grade

7 0

3 years ago

a recent census listed the population of a city as 831,982. marisol rounds the population to 830,000, and lindy rounds the popul

Crazy boy [7]

In my opinion, Marisol would be the correct answer for both A and B. I think, though, that the expected answer would be Lindy for A. I say this because with simple numbers such as 10 or 20, if it's 15+ you'd round it to 20, but if it was 14- you'd round it to 10. Does that makes sense?

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3 years ago

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dmitriy555 [2]

Answer: D

Step-by-step explanation:

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3 years ago

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