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sweet-ann [11.9K]
3 years ago
6

Sandra is showing her work in simplifying (3.3 − 4.2) − 2.8 + 5.7. Identify any error in her work or reasoning. Step 1: (3.3 − 4

.2) − 2.8 + 5.7 Step 2: 3.3 + (− 4.2 − 2.8) + 5.7 (distributive property) Step 3: 3.3 − 7 + 5.7 Step 4: 3.3 + 5.7 − 7 (commutative property) Step 5: 9 − 7 = 2
Mathematics
2 answers:
julsineya [31]3 years ago
8 0
The answer is correct 
but I think in step 2 that should read the Associative property
Mariana [72]3 years ago
3 0

Answer:

Sandra makes an error in second step reasoning .

Step-by-step explanation:

We are given that Sandra is showing her work in simplifying

(3.3-4.2)-2.8+5.7

We have to find the error in her work or reasoning.

Step 1:(3.3-4.2)-2.8+5.7

Step 2:3.3+(-4.2)-2.8)+5.7

Reason: Associative property

Step 3:3.3-7+5.7

Step 4:3.3+5.7-7

Reason: Commutative property

Step 5:9-7=2

Hence, Sandra makes an error in second step reasoning .

Sandra uses distributive property instead of associative property in step 2.

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The amount of money that kailyn earns varies directly with the number of hours she works. if she works for 15 hours and makes 14
Anestetic [448]

Answer:

$390

Step-by-step explanation:

The wage rate for Kailyn is ($146.25/15 hours) = $9.75/hour

40 hours would result in:

(40 hours)*($9.75/hour) = $390

5 0
2 years ago
Which distribution has the greatest spread
Sauron [17]

For solving this question we will use the relationship between the range of data and the spread of data. The relationship is that "Higher the Range of the Data, Higher is the Spread and lower the range of the data then lower is the spread".

So, keeping in mind this definition let us proceed and check each option and measure their range.

We know that Range is measured as

Range=(Highest Value of the Data)-(Lowest Value of the Data)

a. 13.7-3.1=10.6

b. 423.6-1.3=422.3

c. 38.4-7.2=31.2

d. 231.4-5.5=225.9

As we can see Option b. has the largest range and as range is a measure of spread then option b is the distribution which has the largest spread.

4 0
3 years ago
What is 5,782 rounded to the nearest thousand​
olasank [31]

Answer:

6,000

Step-by-step explanation:

because it is a less amount of numbers to get to 6,000 than to get to 5,00

4 0
3 years ago
Read 2 more answers
(6.15x+0.24y)÷1.5+5.9x−1.6y Help plz
nadya68 [22]

Answer:

10x − 1.44y

Step-by-step explanation:

(6.15x + 0.24y) ÷ 1.5 + 5.9x − 1.6y =

= 4.1x + 0.16y + 5.9x − 1.6y

= 10x − 1.44y

8 0
3 years ago
Read 2 more answers
The probability distribution function for the discrete random variable where x is equal to the number of red lights drivers typi
Ivahew [28]

Using probability concepts, it is found that:

a) The missing value is 0.04.

b) The mean is of 0.37.

The distribution is given by:

P(X = 0) = 0.76

P(X = 1) = 0.15

P(X = 2) = 0.05

P(X = 3) = x

Item a:

The sum of <u>all the probabilities has to be 1</u>, that is:

\sum_{i = 0}^{3} P(X = i) = 1

Thus:

0.76 + 0.15 + 0.05 + x = 1

0.96 + x = 1

x = 0.04

The missing value is 0.04.

Item b:

The mean is given by the <u>sum of each outcome multiplied by it's probability</u>, thus:

E(X) = 0(0.76) + 1(0.15) + 2(0.05) + 3(0.04) = 0.37

The mean is of 0.37.

A similar problem is given at brainly.com/question/20709747

7 0
2 years ago
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