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Mandarinka [93]
3 years ago
5

Explain why u would make one of the ascends a tens number when solving an addition problem

Mathematics
1 answer:
Dimas [21]3 years ago
5 0

Children will use the Make a Ten strategy in this lesson, along with other strategies. Remind children that if they are adding two numbers such as 8 + 5, they can regroup the numbers to make adding easier. Tell children that they can take 2 from the 5 and add the 2 to 8 to make a ten. Also remind them that they must remember to subtract the 2 from the 5, leaving a 3, so they add 10 and 3 and get 13. Tell children that they will use this strategy to add two-digit numbers.

Materials: overhead projector, ten-frames and counters, tens and ones workmat, bundles of 10 craft sticks and single sticks, large number line, and large hundred chart

Preparation: Prepare a tens and ones workmat and a ten frame for use on the overhead. Make 9 bundles of craft sticks, 10 per bundle, using rubber bands to hold them together. Or use tens and ones blocks. Make a large number line and hundred chart for the classroom.

Prerequisite Skills and Concepts: Children should know the addition facts to 20 and the strategies used in learning them.


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The Resource Conservation and Recovery Act mandates the tracking and disposal of hazardous waste produced at U.S. facilities. Pr
aniked [119]

Answer:

(a) E(X) =  0.383

The expected number in the sample that treats hazardous waste on-site is 0.383.

(b) P(x = 4) = 0.000169

There is a 0.000169 probability that 4 of the 10 selected facilities treat hazardous waste on-site.

Step-by-step explanation:

Professional Geographer (Feb. 2000) reported the hazardous waste generation and disposal characteristics of 209 facilities.

N = 209

Only eight of these facilities treated hazardous waste on-site.

r = 8

a. In a random sample of 10 of the 209 facilities, what is the expected number in the sample that treats hazardous waste on-site?

n = 10

The expected number in the sample that treats hazardous waste on-site is given by

$ E(X) =  \frac{n \times r}{N} $

$ E(X) =  \frac{10 \times 8}{209} $

$ E(X) =  \frac{80}{209} $

E(X) =  0.383

Therefore, the expected number in the sample that treats hazardous waste on-site is 0.383.

b. Find the probability that 4 of the 10 selected facilities treat hazardous waste on-site

The probability is given by

$ P(x = 4) =  \frac{\binom{r}{x} \binom{N - r}{n - x}}{\binom{N}{n}} $

For the given case, we have

N = 209

n = 10

r = 8

x = 4

$ P(x = 4) =  \frac{\binom{8}{4} \binom{209 - 8}{10 - 4}}{\binom{209}{10}} $

$ P(x = 4) =  \frac{\binom{8}{4} \binom{201}{6}}{\binom{209}{10}} $

$ P(x = 4) =  \frac{70 \times 84944276340}{35216131179263320}

P(x = 4) = 0.000169

Therefore, there is a 0.000169 probability that 4 of the 10 selected facilities treat hazardous waste on-site.

8 0
3 years ago
Choose the answers that have a repeating decimal?
Dmitry [639]
A 0.66... that the repeating decimals
4 0
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HELP! "translate: the product of 8 and a number increased by 2 use x as the variable"
Bumek [7]

Answer:

variable is (<em> </em><em>x</em><em> </em><em>)</em>

<em>∆</em><em>product</em><em> </em><em>of</em><em> </em><em>8</em><em> </em><em>:</em>

<em>8</em><em> </em><em>x</em>

<em>∆</em><em>the</em><em> </em><em>number</em><em> </em><em>increase</em><em>d</em><em> </em><em>by</em><em> </em><em>2</em><em> </em><em>:</em><em> </em>

<em>8</em><em> </em><em>x</em><em> </em><em>+</em><em> </em><em>2</em>

<em>And</em><em> </em><em>we</em><em>'re</em><em> </em><em>done</em><em> </em><em>♥️</em>

3 0
3 years ago
Read 2 more answers
A prism is completely filled with 96 cubes that have edge length of 1/2 cm.
Alexus [3.1K]
Why is it so complicated? Volume of one cube is 1/2 * 1/2 * 1/2 = 1/8 cm^3

Volume of prism is 1/8 * 96 = 12 cm^3
6 0
3 years ago
Read 2 more answers
PLEASE HELP ILL MARK THE BRAINLIEST DO NOT WASTE ANSWERRS URGENT
AVprozaik [17]
The answer is D 4+6=7+8
7 0
3 years ago
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