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2 years ago

What property is (67+83)+32=(32+67)+83

Mathematics

1 answer:

muminat2 years ago

3 0

Answer:

Distributive property

Step-by-step explanation:

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Use the given information to find the value of x. Then, find the measure of angle ADC.

skad [1K]

Answer:

60degrees

Step-by-step explanation

To get the angle x, you must first know that the sum of angle at a point is 360degrees. Hence;

x + <ADB + <CDB = 360

x +150 + 150 = 360

x+ 300 = 360

x = 360 - 300

x = 60

Hence the value of x is 60degrees

5 0

3 years ago

1A technical magazine stated that the mean retail cost of all models of a particular laptop was $600. A random sample of 10 stor

My name is Ann [436]

Answer:

Yes

Step-by-step explanation:

Given,

Population mean Z = 600

Sample mean, µ = 586.50

Size of the sample, n = 10

Standard deviation, σ = 26.77

The testing hypothesis is,

Null hypothesis = µ<600

Alternative hypothesis = µ≥600

The test statistics is the calculated value of Z,

(Z- µ)/(σ/√n)

= (600-586.50)/(26.77/√10)

= (13.5*3.1623)/26.77

= 42.691/26.77

= 1.5947

And at 5% level of significance, the table value of Z = 1.644

Here, calculated Z<Table value of Z, so we accept the null hypothesis.

So, the null hypothesis is accepted. The mean value of the laptop is less than 600.

3 0

3 years ago

To be able to do the problem 5(10 + 4) mentally, Zack does 50 + 20 instead of 5(14).

Maurinko [17]

He used distributive property

7 0

3 years ago

Robert bought his car 4 years ago.

Anni [7]

If i'm correct. it should be $10,022.40

3 0

3 years ago

The mean temperature for the first 4 days in January was 1°C.

schepotkina [342]

Answer:

The temperature on the 5th day was of -9ºC.

Step-by-step explanation:

Mean of a data-set

The mean of a data-set is the sum of all values in the data-set divided by the number of values.

The mean temperature for the first 4 days in January was 1°C.

This means that during the first 4 days, the sum of the temperatures was 4*1 = 4ºC.

The mean temperature for the first 5 days in January was -1°C.

First 4 days: Sum of 4º

5th day: Temperature of x.

The mean is -1, so:

$-1 = \frac{4 + x}{5}$

$x + 4 = -5$

$x = -9$

The temperature on the 5th day was of -9ºC.

8 0

3 years ago