All categories

3 years ago

Use the propotion to convert millimeters to centimeters.

Mathematics

2 answers:

aksik [14]3 years ago

8 0

Number 1 is 4.7cm
number 2 is 720 cm

PilotLPTM [1.2K]3 years ago

6 0

Answer:

Step-by-step explanation:

Since 10 mm = 1 cm

we can convert 47 mm as 47x1/10 = 4.7 cm.

----------------------------------------

SInce conversion factor for milligrams to grams is 1000 mg = 1 gram

we have

2900 mg = 2900/1000 = 2.9 gms.

-------------------------------------------

For conversion of m to cm we have conversion factors as

1 m = 100 cm.

Hence 7.2 m = 7.2x100 cm = 720 cm.

You might be interested in

Mr. Lee bought rock to landscape around his house. He bought seven ton of rock for $151.13. How much did the rock cost per ton?

Mazyrski [523]

Answer:

A. $21.59

Step-by-step explanation:

$151.13 ÷ 7 tons= $21.59 each per ton

8 0

3 years ago

Read 2 more answers

Explain why 3/4 of 16 is the same as 3x16 divided by four?

kolbaska11 [484]

Its not. because 16 / .75 (which is 3/4) = 21.33--

3 * 16 = 48 / 4 = 12

I hope this helps :)

4 0

3 years ago

What is 5/8+2/5 in its simplest form (thanks to all the people who helped me before with the rest of the problems I just posted

Sedbober [7]

The answer is 1 1/40 because u have to change the Denominator

3 0

3 years ago

How much miles is a light year

skelet666 [1.2K]

1 light-year = roughly 5,874,601,700,000 miles. (rounded)

To work it out, take the speed of light, and change units a few times:

      (186,282.397 miles/second)
times
          (86,400 second/day)
times
          (365 day/year)

=   (186,282.397 x 86,400 x 365) mile/year .

You can whip that out on your calculator in no time.

8 0

3 years ago

A random sample from a normal population is obtained, and the data are given below. Find a 90% confidence interval for . 114 157

melamori03 [73]

Answer:

$103.160 \leq \sigma \leq 187.476$

And the upper bound rounded to the nearest integer would be 187.

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Solution to the problem

Data given: 114 157 203 257 284 299 305 344 378 410 421 450 478 480 512 533 545

The confidence interval for the population variance $\sigma^2$ is given by the following formula:

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

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

$s=sqrt{\frac{\sum_{i=1}^{17} (x_i -\bar x)^2}{n-1}}$

And in order to find the sample mean we just need to use this formula:

$\bar x =\frac{\sum_{i=1}^n x_i}{n}$

The sample mean obtained on this case is $\bar x= 362.941$ and the deviation s=132.250

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

$df=n-1=17-1=16$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a tabel to find the critical values.