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2 years ago

Simplify the following expressions below using the distributive property and by combining like terms.

Mathematics

1 answer:

Goryan [66]2 years ago

5 0

Answer:

your answers would be : -2+2x+3x-4+3

-3y-2+3y-4

2+3+2y+3x

Step-by-step explanation:

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What is nine more than a number y, if that number is 4?

IceJOKER [234]

Answer:

Step-by-step explanation:

if y = 4, then 4 + 9 = 13

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2 years ago

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Sum term product factor quotients coefficients for 5x+12

Svetllana [295]

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2 years ago

bob charges 6.25 per hour for washing cars, If he works 8 1/2 hours a day, about how much money would bob make in a 5 day week?

Komok [63]

Answer:

265.65

Step-by-step explanation:

6.25*8 =50

6.25/2=3.13

50+3.13=53.13

53.13*5=265.65

6 0

3 years ago

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I do 10 - 8 for this, right...?

natima [27]

No, you would do 100 - 64 because 10^2 is 100 and 8^2 is 64.
100-64= 36
The square root of 36 is 6. The length of the other leg is 6.

6 0

3 years ago

Evelyn wants to estimate the percentage of people who own a tablet computer she surveys 150 indvidals and finds that 120 own a t

igomit [66]

Answer:

The 99% confidence interval for the percentage of people who own a tablet computer is between 71.59% and 88.41%

Step-by-step explanation:

Confidence interval for the proportion of people who own a tablet:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 150, \pi = \frac{120}{150} = 0.8$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.576$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 2.575\sqrt{\frac{0.8*0.2}{150}} = 0.7159$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 2.575\sqrt{\frac{0.8*0.2}{150}} = 0.8841$

Percentage:

Multiply the proportion by 100.

0.7159*100 = 71.59%

0.8841*100 = 88.41%

The 99% confidence interval for the percentage of people who own a tablet computer is between 71.59% and 88.41%

8 0

2 years ago