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Oksi-84 [34.3K]
3 years ago
13

What's the anewer to this problem..?

Mathematics
2 answers:
valentina_108 [34]3 years ago
4 0
21x(9)=9x21
21y= 9x21
Y=9x21/21
Y=9x1
Y=9
Elanso [62]3 years ago
3 0

<u>Answer:</u> The correct answer is 9.

<u>Step-by-step explanation:</u>

Multiplication property of equality is defined as the property in which the a number multiplied on one side of the equation must be multiplied to the other side of the equation with the same sign.

a\times c=b\times c

c is multiplied on both the sides of the reaction.

In the given question:

21\times x=9\times 21

Thus, the value of 'x' will be 9 by associative property.

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A train left a station at 8:13 a.m. arriving at its destination at 4:52 p.m. If the stations are 527.65 miles apart, calculate t
Tomtit [17]

9514 1404 393

Answer:

  D.  61 mi/h

Step-by-step explanation:

The travel time is 16:52 -8:13 = 8:39 hours, or 8.65 hours. Then the speed is ...

 speed = distance/time = 527.65 mi/(8.65 h) = 61 mi/h

_____

<em>Additional comment</em>

It is often convenient to use "military" or "24-hour" time for calculations of time periods that extend over noon or midnight. For this purpose, 12 gets added to the hour number in the afternoon (pm). Of course, 39 minutes is 39/60 hours. That is found to be 0.65 hours by performing the division of 39 by 60.

6 0
3 years ago
If 15 pen cost $3.90, which equation would help determine the cost of 6 pens?
madreJ [45]

Answer

1.56

Step-by-step explanation:

You must find the unit rate. To do so, you must divide 3.90 by 15. That will give you 0.26. After, times 6 and .26 to get your answer. Hope this helps.

8 0
3 years ago
What is the value of a + bc when a = 7, b = 4, and c =8
Bess [88]

Answer:

answer is 39

Step-by-step explanation:

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4 0
3 years ago
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What % of $30,000 = $15,000
sammy [17]
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5 0
3 years ago
Carry out the following division.​
kifflom [539]

Answer:

1: 8a²

2: 9a²b²c²

Step-by-step explanation:

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48÷6 = 8

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2: 72a³b⁴c⁵ ÷ 8ab²c³

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2 years ago
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