Ask question

Ask question

All categories

sergiy2304 [10]

2 years ago

14

Help ASAP

1 answer:

kramer2 years ago

5 0

Answer:

x=19/5

Step-by-step explanation:

x*2+8x=38

10x =38

You might be interested in

What percent of 40 is 14?

Lemur [1.5K]

First translate the question into an equation.

"What percent" means x/100, "of 40" means times 40, "is 14" equals 14.

So we have (x)(40) = 14 or 40x = 14.

Dividing both sides by 40, we find that x = 0.35.

Now, we want to write our answer as a percent.

So we move the decimal 2 places to the right and we have 35%.

3 0

2 years ago

You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e

victus00 [196]

You intend to estimate a population mean μ from the following sample. 26.2 27.7 8.6 3.8 11.6 You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to twp decimal places.

Answer:

The Confidence interval = (8.98 , 22.18)

Step-by-step explanation:

From the given information:

mean = $\dfrac{ 26.2+ 27.7+ 8.6+ 3.8 +11.6 }{5}$

mean = 15.58

the standard deviation $\sigma$ = $\sqrt{\dfrac{\sum(x_i - \mu)^2 }{n}}$

the standard deviation = $\sqrt{\dfrac{(26.2 - 15.58)^2 +(27.7 - 15.58)^2 +(8.6 - 15.58)^2 + (3.8 - 15.58)^2 + (11.6 - 15.58)^2 }{5 } }$

standard deviation = 9.62297

Degrees of freedom df = n-1

Degrees of freedom df = 5 - 1

Degrees of freedom df = 4

For df at 4 and 80% confidence level, the critical value t from t table = 1.533

The Margin of Error M.O.E = $t \times \dfrac{\sigma}{\sqrt{n}}$

The Margin of Error M.O.E = $1.533 \times \dfrac{9.62297}{\sqrt{5}}$

The Margin of Error M.O.E = $1.533 \times 4.3035$

The Margin of Error M.O.E = 6.60

The Confidence interval = ( $\mu \pm M.O.E$ )

The Confidence interval = ( $\mu + M.O.E$ , $\mu - M.O.E$ )

The Confidence interval = ( 15.58 - 6.60 , 15.58 + 6.60)

The Confidence interval = (8.98 , 22.18)

7 0

3 years ago

The table shows the time Merrida spent driving and the number of miles she drove. She drove the same number of miles each hour.

Oksi-84 [34.3K]

Answer:

35 miles per hour

Step-by-step explanation:

175 -140 = 35

35/1 = 35

6 0

3 years ago

A restaurant offered cooking classes on 20 of the 30 day in November.

Stells [14]

The percentage is 66.6%.

3 0

2 years ago

Read 2 more answers

a girl that is 4 feet tall standing 2 feet from a mirror sees the reflection of a flag pole that is 12 feet from the mirror how

Roman55 [17]

Answer:

the pole is 24 feet tall

Step-by-step explanation:

the mirror make every thing half its size

6 0

2 years ago