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liubo4ka [24]
2 years ago
12

cuharra studied Monday and Tuesday for her math test she spent a total of 120 minutes studying. she spend an extra 15 minutes on

Tuesday. how long did she study for on Monday and on tuesday
Mathematics
1 answer:
Mariulka [41]2 years ago
5 0
135? is what i think
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N/8 = 11/5 what is n?
Reika [66]

Answer:

n = 88/5

Step-by-step explanation:

Clear out the fractions by multiplying both sides by 8:

n = 88/5

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If k= am + 3mx, the value of m in terms of a, k, and x can be expressed as
soldier1979 [14.2K]
K=am+3mx
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Which of the following is generally not true about statistical sampling as compared to nonstatistical sampling? (A) Statistical
motikmotik

Answer:

(A) Statistical samples are more representative of the population.

Step-by-step explanation:

The following is generally not true about statistical sampling as compared to non statistical sampling:

(A) Statistical samples are more representative of the population.

Statistical sampling refers to a type of statistical study whose sampling method is based on the way we select samples from the population to take part the study/survey.

6 0
3 years ago
A survey of shoppers is planned to determine what percentage use credit cards. prior surveys suggest​ 63% of shoppers use credit
Alona [7]
We would need a sample size of 560.

We first calculate the z-score associated. with this level of confidence:
Convert 95% to a decimal:  95% = 95/100 = 0.95
Subtract from 1:  1-0.95 = 0.05
Divide by 2:  0.05/2 = 0.025
Subtract from 1:  1-0.025 = 0.975

Using a z-table (http://www.z-table.com) we see that this is associated with a z-score of 1.96.

The margin of error, ME, is given by:
ME=z*\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}

We want ME to be 4%; 4% = 4/100 = 0.04.  Substituting this into our equation, as well as our proportion and z-score,
0.04=1.96\sqrt{\frac{0.63(1-0.63)}{n}}
\\
\\\text{Dividing both sides by 1.96,}
\\
\\\frac{0.04}{1.96}=\sqrt{\frac{0.63(0.37)}{n}}
\\
\\\text{Squaring both sides,}
\\
\\(\frac{0.04}{1.96})^2=\frac{0.63(0.37)}{n}
\\
\\\text{Multiplying both sides by n,}
\\
\\n(\frac{0.04}{1.96})^2=0.63(0.37)
\\
\\n(\frac{0.04}{1.96})^2=0.2331
\\
\\\text{Isolating n,}
\\
\\n=\frac{0.2331}{(\frac{0.04}{1.96})^2}=559.67\approx560
3 0
3 years ago
10x +1 12x-5 solve for x
dimulka [17.4K]

Answer:

x = 3

Step-by-step explanation:

10x + 1 = 12x - 5

Subtract 1 from each side

10x = 12x - 6

Subtract 12x from each side

-2x = -6

Divided by -2

x = 3

5 0
3 years ago
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