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3 years ago

What is -4+(-8+j)= simplified

Mathematics

1 answer:

fgiga [73]3 years ago

6 0

Answer:

Step-by-step explanation:

−4−8+j

=−4+−8+j

Combine Like Terms:

=−4+−8+j

=(j)+(−4+−8)

=j+−12

Answer:

=j−12

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3 tomatoes cost $1.29<br><br> How much will 5 tomatoes<br> cost?

wolverine [178]

Answer:

$2.15

Step-by-step explanation:

Since 3 Tomatoes cost $1.29

Then let's first find how much is 1 Tomatoes.

To do that we have to divide Cost by # of Tomatoes

3/1.29 = 0.43

Thus, 1 Tomatoes Cost 0.43

Now, the question is: How much will 5 tomatoes cost?

Therefore, 0.43 * 5 =2.15

Hence, 5 Tomatoes cost $2.15

[RevyBreeze]

6 0

3 years ago

Flow meters are installed in urban sewer systems to measure the flows through the pipes. In dry weatherconditions (no rain) the

ziro4ka [17]

Answer:

a) $\frac{(8)(30.23)^2}{20.09} \leq \sigma^2 \leq \frac{(8)(30.23)^2}{1.65}$

$363.90 \leq \sigma^2 \leq 4430.80$

Now we just take square root on both sides of the interval and we got:

$19.08 \leq \sigma \leq 66.56$

b) For this case we are 98% confidence that the true deviation for the population of interest is between 19.08 and 66.56

Step-by-step explanation:

423.6, 487.3, 453.2, 402.9, 483.0, 477.7, 442.3, 418.4, 459.0

Part a

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

On this case we need to find the sample standard deviation with the following formula:

$s=sqrt{\frac{\sum_{i=1}^8 (x_i -\bar x)^2}{n-1}}
And in order to find the sample mean we just need to use this formula:
[tex]\bar x =\frac{\sum_{i=1}^n x_i}{n}$

The sample deviation for this case is s=30.23

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

$df=n-1=9-1=8$

The Confidence interval is 0.98 or 98%, the value of $\alpha=0.02$ and $\alpha/2 =0.01$ , and the critical values are:

$\chi^2_{\alpha/2}=20.09$

$\chi^2_{1- \alpha/2}=1.65$

And replacing into the formula for the interval we got:

$\frac{(8)(30.23)^2}{20.09} \leq \sigma^2 \leq \frac{(8)(30.23)^2}{1.65}$

$363.90 \leq \sigma^2 \leq 4430.80$

Now we just take square root on both sides of the interval and we got:

$19.08 \leq \sigma \leq 66.56$

Part b

For this case we are 98% confidence that the true deviation for the population of interest is between 19.08 and 66.56

4 0

3 years ago

Tyler is making a wooden post that is 3.5 feet in length he polices marks one and 1/3 in A part on the post after making 20 mark

ZanzabumX [31]

Answer:

Tyler is right

Step-by-step explanation:

Given that:

Lenght of wooden plank used = 3.5 feets

Placement of tick marks = 1 1/3 inches apart

Number of tick marks placed = 20

Recall:

1 foot = 12 inches

Hence, length of wooden post in inches :

3.5 * 12 = 42 inches on length

Total length covered by the ticks placed :

1 1/3 inches * Number of ticks placed

1. 333 * 20 = 26.6667 inches

Unmarked length = length of post - length covered by tickmark

Unmarked length = (42 - 26.6666) inches

Unmarked length = 15.3333 inches.

Hence,

Within 15 - 16 inches are yet to be marked.

3 0

3 years ago

Oscar paid $88.68 for 3 large bags of dog food.

defon

The answer is C. 29.56

4 0

3 years ago

Read 2 more answers

The graph shows the percent of employees who take time off during one year because of colds. A company has 84408440 employees. U

Nitella [24]

(24% ÷ 100) × 8440= 2025.6

now we round 2025.6 which is 2026 employees

ANOTHER METHOD WOULD BE:

24% × 8440 = 2025.6 rounded to 2026

or 0.24 × 8440 = 2025.6 rounded to 2026

3 0

3 years ago