All categories

3 years ago

The length of a rectangle is 3 times the width if the area is 147 what is the perminer

1 answer:

7 0

Formula for are of a rectangle:
   A =L * W
1st isolate W
147 = 3W * W
147 = 3W^2
divide 147 by the by 3 on bot sides
  29 = W^2
get ride of the square by square rooting on both sides
   7 = W

2nd find the perimeter
P = 2(7) + 2(21)
  P = 14 + 42
P = 56

You might be interested in

Jessica has 5 members in the sewing club that she started. In order to get school sponsorship she must have at least 30 members.

inn [45]

Answer:

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

For the polynomial shown below find f(1).<br><br><br>f(x)=3x^4-x^2+4x-2

Feliz [49]

Answer:

f(1)=4

Step-by-step explanation:

f(1)=3(1)^4-(1)^2+4(1)-2

f(1)=3(1)-1+4-2

f(1)=3-1+4-2

f(1)=4

6 0

3 years ago

Assume that body masses of Goldfinch birds follow a normal distribution with standard deviation equal to 0.04 oz. An ornithologi

il63 [147K]

Answer:

The formula to generate 70% confidence interval is: $[\overline{x} - 0.013, \overline{x} + 0.013]$ , in which $\overline{x}$ is the sample mean.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.7}{2} = 0.15$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.15 = 0.85$ , so Z = 1.037.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Assume that body masses of Goldfinch birds follow a normal distribution with standard deviation equal to 0.04 oz.

This means that $\sigma = 0.04$ .

Sample of 10 birds:

This means that $n = 10$ .

The margin of error is of:

$M = z\frac{\sigma}{\sqrt{n}}$

$M = 1.037\frac{0.04}{\sqrt{10}}$

$M = 0.013$

The lower end of the interval is the sample mean of $\overline{x}$ subtracted by M.

The upper end of the interval is the sample mean of $\overline{x}$ added to M.

Then, the formula to generate 70% confidence interval is: $[\overline{x} - 0.013, \overline{x} + 0.013]$ , in which $\overline{x}$ is the sample mean.

8 0

3 years ago

6.8 dollars. How do you write the decimal 6.8 when it refers ti money

Rainbow [258]

$ 6.80.

hope that helped

7 0

3 years ago

Read 2 more answers

Rosita earned $325 for working 25 hours last week. What is her hourly rate?

miskamm [114]

Answer:

Step-by-step explanation: 325/25=13